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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge" >
<link rel="dns-prefetch" href="https://21cm.js.org">
<title>21cm</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="description" content="21cm.js.org是一个专注web前端开发，关注用户体验，关注国内外最新最好的前端开发技术和前端开发资讯的专业博客">
<meta name="keywords" content="21cm,web前端开发, 前端开发工程师, 前端资源, CSS, JavaScript, Ajax, jQuery, html,html5,css3,浏览器兼容, 前端开发工具, 前端招聘, jQuery API, CSS整形和优化工具 , JS压缩工具 , JS格式化工具 , CSS参考手册 ,HTML参考手册">
<meta property="og:type" content="website">
<meta property="og:title" content="21cm">
<meta property="og:url" content="https://21cm.js.org/index.html">
<meta property="og:site_name" content="21cm">
<meta property="og:description" content="21cm.js.org是一个专注web前端开发，关注用户体验，关注国内外最新最好的前端开发技术和前端开发资讯的专业博客">
<meta property="og:locale" content="zh-CN">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="21cm">
<meta name="twitter:description" content="21cm.js.org是一个专注web前端开发，关注用户体验，关注国内外最新最好的前端开发技术和前端开发资讯的专业博客">
<link rel="alternative" href="/atom.xml" title="21cm" type="application/atom+xml">
<link rel="icon" href="/21cm.jpg">
<link rel="stylesheet" type="text/css" href="/./main.0cf68a.css">
<style type="text/css">
#container.show {
background: linear-gradient(200deg,#a0cfe4,#e8c37e);
}
</style>
</head>
<body>
<div id="container" q-class="show:isCtnShow">
<canvas id="anm-canvas" class="anm-canvas"></canvas>
<div class="left-col" q-class="show:isShow">
<div class="overlay" style="background: #4d4d4d"></div>
<div class="intrude-less">
<header id="header" class="inner">
<a href="/" class="profilepic">
<img src="https://avatars2.githubusercontent.com/u/39575040?s=460&v=4" class="js-avatar">
</a>
<hgroup>
<h1 class="header-author"><a href="/">21cm</a></h1>
</hgroup>
<p class="header-subtitle">愿用三生烟火，换你一世迷离。</p>
<nav class="header-menu">
<ul>
<li><a href="/">首页</a></li>
<li><a href="/archives">分类</a></li>
</ul>
</nav>
<nav class="header-smart-menu">
<a q-on="click: openSlider(e, 'innerArchive')" href="javascript:void(0)">所有文章</a>
</nav>
<nav class="header-nav">
<div class="social">
<a class="github" target="_blank" href="https://github.com/21cm" title="github"><i class="icon-github"></i></a>
<a class="rss" target="_blank" href="https://21cm.js.org/atom.xml" title="rss"><i class="icon-rss"></i></a>
<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=330 height=86 src="//music.163.com/outchain/player?type=2&id=31445554&auto=1&height=66"></iframe>
</div>
</nav>
</header>
</div>
</div>
<div class="mid-col" q-class="show:isShow,hide:isShow|isFalse">
<nav id="mobile-nav">
<div class="overlay js-overlay" style="background: #4d4d4d"></div>
<div class="btnctn js-mobile-btnctn">
<div class="slider-trigger list" q-on="click: openSlider(e)"><i class="icon icon-sort"></i></div>
</div>
<div class="intrude-less">
<header id="header" class="inner">
<div class="profilepic">
<img src="https://avatars2.githubusercontent.com/u/39575040?s=460&v=4" class="js-avatar">
</div>
<hgroup>
<h1 class="header-author js-header-author">21cm</h1>
</hgroup>
<p class="header-subtitle"><i class="icon icon-quo-left"></i>愿用三生烟火，换你一世迷离。<i class="icon icon-quo-right"></i></p>
<nav class="header-nav">
<div class="social">
<a class="github" target="_blank" href="https://github.com/21cm" title="github"><i class="icon-github"></i></a>
<a class="rss" target="_blank" href="https://21cm.js.org/atom.xml" title="rss"><i class="icon-rss"></i></a>
</div>
</nav>
<nav class="header-menu js-header-menu">
<ul style="width: 50%">
<li style="width: 50%"><a href="/">首页</a></li>
<li style="width: 50%"><a href="/archives">分类</a></li>
</ul>
</nav>
</header>
</div>
<div class="mobile-mask" style="display:none" q-show="isShow"></div>
</nav>
<div id="wrapper" class="body-wrap">
<div class="menu-l">
<div class="canvas-wrap">
<canvas data-colors="#eaeaea" data-sectionHeight="100" data-contentId="js-content" id="myCanvas1" class="anm-canvas"></canvas>
</div>
<div id="js-content" class="content-ll">
<article id="post-javascript-Quick-check-list" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/09/18/javascript-Quick-check-list/">javascript速查表</a>
</h1>
<a href="/2018/09/18/javascript-Quick-check-list/" class="archive-article-date">
<time datetime="2018-09-18T06:37:03.160Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-09-18</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<ul>
<li>数组</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">concat() 连接两个或更多的数组，并返回结果。</span><br><span class="line">join() 把数组的所有元素放入一个字符串。元素通过指定的分隔符进行分隔。</span><br><span class="line">pop() 删除并返回数组的最后一个元素</span><br><span class="line">push() 向数组的末尾添加一个或更多元素，并返回新的长度。</span><br><span class="line">reverse() 颠倒数组中元素的顺序。</span><br><span class="line">shift() 删除并返回数组的第一个元素</span><br><span class="line">slice() 从某个已有的数组返回选定的元素 </span><br><span class="line">sort() 对数组的元素进行排序</span><br><span class="line">splice() 删除元素，并向数组添加新元素。</span><br><span class="line">toString() 把数组转换为字符串，并返回结果。</span><br><span class="line">unshift() 向数组的开头添加一个或更多元素，并返回新的长度。</span><br><span class="line">valueOf() 返回数组对象的原始值</span><br></pre></td></tr></table></figure>
<ul>
<li><p>String 对象方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">concat() 连接字符串。。</span><br><span class="line">indexOf() 检索字符串。</span><br><span class="line">lastIndexOf() 从后向前搜索字符串。</span><br><span class="line">slice() 提取字符串的片断，并在新的字符串中返回被提取的部分。</span><br><span class="line">split() 把字符串分割为字符串数组。</span><br><span class="line">toString() 返回字符串。</span><br><span class="line">valueOf() 返回某个字符串对象的原始值。</span><br><span class="line">length 字符串的长度</span><br></pre></td></tr></table></figure>
</li>
<li><p>History</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">back() 加载 history 列表中的前一个 URL。</span><br><span class="line">forward() 加载 history 列表中的下一个 URL。</span><br><span class="line">go() 加载 history 列表中的某个具体页面。</span><br><span class="line">Location</span><br><span class="line">hash 设置或返回从井号 (#) 开始的 URL（锚）。</span><br><span class="line">host 设置或返回主机名和当前 URL 的端口号。</span><br><span class="line">hostname 设置或返回当前 URL 的主机名。</span><br><span class="line">href 设置或返回完整的 URL。</span><br><span class="line">pathname 设置或返回当前 URL 的路径部分。</span><br><span class="line">search 设置或返回从问号 (?) 开始的 URL（查询部分）。</span><br><span class="line">assign() 加载新的文档。</span><br><span class="line">reload() 重新加载当前文档。</span><br><span class="line">replace() 用新的文档替换当前文档。</span><br></pre></td></tr></table></figure>
</li>
<li><p>Document</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">document.cookie 设置或返回与当前文档有关的所有 cookie。</span><br><span class="line">document.referrer 返回载入当前文档的文档的 URL。</span><br><span class="line">document.title 返回当前文档的标题。</span><br><span class="line">document.links 返回文档中所有的Area和Link对象引用</span><br><span class="line">document.getElementById() 返回对拥有指定 id 的第一个对象的引用。</span><br><span class="line">document.querySelector() CSS 选择器 语法跟jquery一样</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>document.body 网页宽、高、偏移属性<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">网页可见区域宽： document.body.clientWidth </span><br><span class="line">网页可见区域高： document.body.clientHeight </span><br><span class="line">网页可见区域宽： document.body.offsetWidth (包括边线的宽) </span><br><span class="line">网页可见区域高： document.body.offsetHeight (包括边线的高) </span><br><span class="line">网页正文全文宽： document.body.scrollWidth (不包括边线的宽) </span><br><span class="line">网页正文全文高： document.body.scrollHeight (不包括边线的高) </span><br><span class="line">网页被卷去的高： document.body.scrollTop </span><br><span class="line">网页被卷去的左： document.body.scrollLeft</span><br></pre></td></tr></table></figure></p>
<ul>
<li><p>操作文档对象</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">document.createElement('div') 创建并返回一个元素</span><br><span class="line">document.createTextNode('title') 创建并返回一个文本节点</span><br><span class="line">document.createAttribute('title')创建并返回一个属性节点</span><br><span class="line">document.createComment('comment') 创建并返回一个注释节点</span><br><span class="line">document.createDocumentFragment() 创建并返回一个文档片段</span><br><span class="line">document.getElementById('idName') 返回指定id的元素</span><br><span class="line">document.querySelector('#id .className') 返回文档中匹配指定的css选择器的第一元素</span><br><span class="line">document.querySelectorAll() 返回文档中匹配的css选择器的所有元素节点列表</span><br><span class="line">document.getElementsByClassName('className') 返回指定className的NodeList集合</span><br><span class="line">document.images 返回文档中所有Image对象引用</span><br></pre></td></tr></table></figure>
</li>
<li><p>Element</p>
</li>
<li><ul>
<li>element 方法<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">element.getElementsByTagName() 获取元素内的所有指定标签的子元素</span><br><span class="line">element.insertBefore() 在指定的已有的子节点之前插入新节点。</span><br><span class="line">element.appendChild() 向元素添加新的子节点，作为最后一个子节点。</span><br><span class="line">element.getAttribute() 返回元素节点的指定属性值。</span><br><span class="line">element.getAttributeNode() 返回指定的属性节点。</span><br><span class="line">element.setAttribute() 设置元素节点指定属性与值</span><br><span class="line">element.removeChild() 从元素中移除子节点</span><br><span class="line">element.replaceChild(newnode,oldnode) 用一个新元素替换列表中的某个元素 </span><br><span class="line">element.removeAttribute() 从元素中移除指定属性</span><br><span class="line">element.removeAttributeNode() 移除指定属性节点，并返回被移除的节点</span><br><span class="line">element.hasAttribute() 判断元素是否拥有指定属性</span><br><span class="line">element.hasAttributes() 判断元素是否拥有属性</span><br><span class="line">element.hasChildNodes() 判断元素是否拥有子元素</span><br><span class="line">element.isEqualNode(node) 判断两个元素是否相等</span><br><span class="line">element.normalize() 移除空的文本节点，并连接相邻的文本节点</span><br><span class="line">element.childNodes.item(0) 返回NodeList中位于指定下标的节点</span><br><span class="line">element.cloneNode(deep) 克隆节点，deep默认为false，为false克隆节点，为true克隆节点及后代</span><br><span class="line">element.compareDocumentPosition() 比较两个元素的文档位置，1：没有关系，两个节点不属于同一文档。2：第一节点位于第二节点后。4：第一节点定位在第二节点前。8：第一节点位于第二节点内。16：第二节点位于第一节点内。32：没有关系，或是两个节点是同一元素的两个属性，返回值可以是值的组合，例如，返回20意味着第二节点在第一节点内部（16），并且第二节点在第一节点之后(4)</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
<li><ul>
<li>element 属性<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line">element.id 设置或返回元素的 id。</span><br><span class="line">element.tagName 获取元素的标签名(大写)</span><br><span class="line">element.className 元素所有的 class 逗号分隔。</span><br><span class="line">element.classList 元素所有的 class 数组形式。</span><br><span class="line">element.style 设置或返回元素的style属性</span><br><span class="line">element.innerText 设置或返回元素的内容</span><br><span class="line">element.innerHTML 设置或返回元素的HTML内容。</span><br><span class="line">element.textContent 设置或返回节点及其后代的文本内容</span><br><span class="line">element.nodeName 获取元素的名称</span><br><span class="line">element.nodeValue 设置或返回元素值</span><br><span class="line">element.nodeType 获取节点类型（共12中类型 1:Element,2:Attr,3:Text,8:注释,9:根节点，11:DocumentFragment）</span><br><span class="line">element.attributes 返回元素属性的 NamedNodeMap。</span><br><span class="line">element.parentNode 返回元素父节点</span><br><span class="line">element.childNodes 获取元素直接后代的HTML元素和TextNode对象的集合</span><br><span class="line">element.firstChild 获取元素首个子元素</span><br><span class="line">element.lastChild 获取元素最后一个子元素</span><br><span class="line">element.previousSibling 获取上一个同级节点</span><br><span class="line">element.nextSibling 获取下一个同级节点</span><br><span class="line">element.accessKey 设置或返回元素的快捷键</span><br><span class="line">element.title 设置或返回元素的title </span><br><span class="line">element.isContentEditable 返回元素是否可编辑</span><br><span class="line">element.ownerDocument 返回根元素document</span><br><span class="line">element.childNodes.length 返回NodeList中节点数</span><br><span class="line">element.offsetXX 节点宽、高、偏移（包括滚动条、边框）</span><br><span class="line">element.offsetWidth 元素的宽度(包括padding、border、width)</span><br><span class="line">element.offsetHeight 元素的高度(包括padding、border、width)</span><br><span class="line">element.offsetLeft 元素的左偏移位置</span><br><span class="line">element.offsetTop 元素的上偏移位置</span><br><span class="line">element.offsetParent 元素的偏移容器</span><br><span class="line">elment.scrollXX 节点宽、高、卷边（padding加元素内容的宽高）</span><br><span class="line">element.scrollHeight 元素的完整高度(padding+内容高，不含边框)</span><br><span class="line">element.scrollWidth 元素的整体宽度(padding+内容宽，不含边框)</span><br><span class="line">element.scrollLeft 元素左边卷去的距离</span><br><span class="line">element.scrollTop 元素上边卷去的距离</span><br><span class="line">element.clientXX 节点宽、高、边框（padding加元素内容的宽高）</span><br><span class="line">element.clientHeight 元素的高度(padding+内容高，不含边框)</span><br><span class="line">element.clientWidth 元素的宽度(padding+内容宽，不含边框)</span><br><span class="line">element.clientLeft 元素的左边框宽度</span><br><span class="line">element.clientTop 元素的上边框宽度</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
<li><p>获取网页屏幕宽高</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">网页正文部分上： window.screenTop </span><br><span class="line">网页正文部分左： window.screenLeft </span><br><span class="line">屏幕分辨率的高： window.screen.height </span><br><span class="line">屏幕分辨率的宽： window.screen.width </span><br><span class="line">屏幕可用工作区高度： window.screen.availHeight </span><br><span class="line">屏幕可用工作区宽度： window.screen.availWidth</span><br><span class="line">屏幕可视区域的宽度：window.innerWidth （包括边框、边距、滚动条，不包括工具条）</span><br><span class="line">屏幕可视区域的高度：window.innerHeight（包括边框、边距、滚动条，不包括工具条）</span><br><span class="line">屏幕可视区域的宽度：window.outerWidth （包括边框、边距、滚动条、工具条）</span><br><span class="line">屏幕可视区域的高度：window.outerHeight （包括边框、边距、滚动条、工具条）</span><br></pre></td></tr></table></figure>
</li>
<li><p>事件</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">element.addEventListener(event,handler,useCapture) 向文档添加事件句柄,useCapture为true为捕获型事件，为false为冒泡型事件，默认为false，捕获型事件从外向内冒泡且无法停止，冒泡型事件从内向外冒泡，使用`stopPropagation()`停止冒泡</span><br><span class="line">element.removeEventListener(event,handler,userCapture) 移除由addEventListener添加的事件，参数必须与添加时一致</span><br></pre></td></tr></table></figure>
</li>
<li><p>JSON</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">JSON.parse用于从一个字符串中解析出json对象</span><br><span class="line">JSON.stringify()用于从一个对象解析出字符串</span><br></pre></td></tr></table></figure>
</li>
<li><p>Window</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">clearInterval() 取消由 setInterval() 设置的 timeout。</span><br><span class="line">clearTimeout() 取消由 setTimeout() 方法设置的 timeout。</span><br><span class="line">scroll() </span><br><span class="line">scrollTo() 把内容滚动到指定的坐标。</span><br><span class="line">setInterval() 按照指定的周期（以毫秒计）来调用函数或计算表达式。</span><br><span class="line">setTimeout() 在指定的毫秒数后调用函数或计算表达式。</span><br></pre></td></tr></table></figure>
</li>
<li><p>Math 对象方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">abs(x) 返回数的绝对值。</span><br><span class="line">ceil(x) 对数进行上舍入。</span><br><span class="line">floor(x) 对数进行下舍入。</span><br><span class="line">max(x,y) 返回 x 和 y 中的最高值。</span><br><span class="line">min(x,y) 返回 x 和 y 中的最低值。</span><br><span class="line">random() 返回 0 ~ 1 之间的随机数。</span><br><span class="line">round(x) 把数四舍五入为最接近的整数。</span><br></pre></td></tr></table></figure>
</li>
<li><p>Number 对象方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">toString 把数字转换为字符串，使用指定的基数。</span><br><span class="line">valueOf 返回一个 Number 对象的基本数字值。</span><br></pre></td></tr></table></figure>
</li>
<li><p>Date 对象方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">new Date() 获取当前时间对象</span><br><span class="line">Date.now() 获取当前时间戳</span><br></pre></td></tr></table></figure>
</li>
<li><p>Object 对象方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Object.keys(obj) 获取对象的所有key到数组</span><br><span class="line">Object.values(obj) 获取对象的所有值到数组</span><br><span class="line">Object.assign(obj1,obj2,objn,....) 合并多个对象，key相同后面覆盖前面</span><br><span class="line">Object.create(obj) 以obj为原型生成一个新对象</span><br></pre></td></tr></table></figure></li>
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<article id="post-function.prototype.bind" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/06/15/function.prototype.bind/">函数节流与防抖</a>
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<a href="/2018/06/15/function.prototype.bind/" class="archive-article-date">
<time datetime="2018-06-15T11:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-06-15</time>
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<p>假设浏览器窗口滚动条滚动时会调用一个方法fn,下面一步步实现一个节流函数.</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br></pre></td><td class="code"><pre><span class="line"> * 第一个版本</span><br><span class="line"> * 缺点:产生了全局变量</span><br><span class="line"><script></span><br><span class="line"> var timer;</span><br><span class="line"> window.onscroll = function () {</span><br><span class="line"> clearTimeout(timer);</span><br><span class="line"> timer = setTimeout(function () {</span><br><span class="line"> console.log('window scroll...');</span><br><span class="line"> }, 200);</span><br><span class="line"> }</span><br><span class="line"></script></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> * 第二个版本,使用闭包来封装全局变量</span><br><span class="line"> * 缺点:如果用户不停的滚动滚动条,那么延时函数一次都不会触发</span><br><span class="line"><script></span><br><span class="line"> var throttle = function (fn, delay) {</span><br><span class="line"> var timer = null;</span><br><span class="line"> return function () {</span><br><span class="line"> clearTimeout(timer);</span><br><span class="line"> timer = setTimeout(function () {</span><br><span class="line"> fn();</span><br><span class="line"> }, delay);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> var f = throttle(testFn, 200);</span><br><span class="line"> window.onscroll = function () {</span><br><span class="line"> f();</span><br><span class="line"> };</span><br><span class="line"></script></span><br><span class="line"></span><br><span class="line"> * 于是我们又要添加一个功能：当用户触发 scroll 的时候应该 在某段时间 内至少触发一次，既然是在某段时间内，</span><br><span class="line"> * 那么这个判断条件就可以取当前的时间毫秒数，每次函数调用把当前的时间和上一次调用时间相减，然后判断差值如果大于 某段时间 就直接触发，</span><br><span class="line"> * 否则还是走 timeout 的延迟逻辑。</span><br><span class="line"> 下面的代码里面需要指出的是：</span><br><span class="line"> 1. previous 变量的作用和 timer 类似，都是记录上一次的标识，必须是相对的全局变量</span><br><span class="line"> 2. 如果逻辑流程走的是“至少触发一次”的逻辑，那么函数调用完成需要把 previous 重置成当前时间，简单来说就是：相对于下一次的上一次其实就是当前</span><br><span class="line"> </span><br><span class="line"><script></span><br><span class="line"></span><br><span class="line"> var COUNT = 0, demo = document.getElementById('demo');</span><br><span class="line"> function testFn() {</span><br><span class="line"> demo.innerHTML += 'testFN 被调用了 ' + ++COUNT + '次<br>';</span><br><span class="line"> }</span><br><span class="line"> var throttle = function (fn, delay, atleast) {</span><br><span class="line"> var timer = null;</span><br><span class="line"> var previous = null;</span><br><span class="line"> return function () {</span><br><span class="line"> var now = +new Date();</span><br><span class="line"> if (!previous) previous = now;</span><br><span class="line"> if (atleast && now - previous > atleast) {</span><br><span class="line"> fn();</span><br><span class="line"> // 重置上一次开始时间为本次结束时间</span><br><span class="line"> previous = now;</span><br><span class="line"> clearTimeout(timer);</span><br><span class="line"> } else {</span><br><span class="line"> clearTimeout(timer);</span><br><span class="line"> timer = setTimeout(function () {</span><br><span class="line"> fn();</span><br><span class="line"> previous = null;</span><br><span class="line"> }, delay);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> };</span><br><span class="line"> window.onscroll = throttle(testFn, 200);</span><br><span class="line"> // window.onscroll = throttle(testFn, 500, 1000);</span><br><span class="line"></script></span><br><span class="line"></span><br><span class="line"><script></span><br><span class="line"> document.getElementById("btn").onclick = throttle(function () {</span><br><span class="line"> console.log("button click...");</span><br><span class="line"> }, 2000);</span><br><span class="line"></span><br><span class="line"> //debounce用于将相同的操作积累到一起再触发，节省性能</span><br><span class="line"> function debounce(fn, delay) {</span><br><span class="line"> var timer = null;</span><br><span class="line"> return function () {</span><br><span class="line"> clearTimeout(timer);</span><br><span class="line"> timer = setTimeout(function () {</span><br><span class="line"> return fn.apply(this, arguments);</span><br><span class="line"> }, delay);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></script></span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2018/05/30/js-this/">this的四种用法</a>
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<time datetime="2018-05-30T02:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-30</time>
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<ul>
<li>javascript中this的指向有4种情况:</li>
<li>1.作为普通函数调用: <code>this</code>指向全局对象</li>
<li>2.作为对象方法调用: <code>this`</code>指向该对象</li>
<li>3.构造器调用: this指向构造器返回的对象</li>
<li>4.<code>Function.prototype.call</code> 和 <code>Function.prototype.apply</code>调用: <code>this</code>指向动态传入的对象</li>
</ul>
<ul>
<li>丢失的this</li>
<li>例子:</li>
<li><code>document.getElementById</code>这个函数名字太长,可以使用一个短点的函数来代替,例如prototype.js做法:</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">var getId = function (id) {</span><br><span class="line"> return document.getElementById(id);</span><br><span class="line">}</span><br><span class="line">getId('div1');</span><br></pre></td></tr></table></figure>
<ul>
<li>注意: 使用下面的方式是错误的!!!!!!!</li>
<li><code>var getId=document.getElementById;</code> 错误做法!!!</li>
<li>因为<code>document.getElementById</code>这个方法的实现需要使用this指针,this指针期望指向document对象,</li>
<li>而这种做法作为普通函数调用,this指向了全局对象,即window,所以会出错!!<br>可以使用apply传入document来帮助修正this:</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">document.getElementById = (function (func) {</span><br><span class="line"> return function () {</span><br><span class="line"> return func.apply(document, arguments);</span><br><span class="line"> }</span><br><span class="line">})(document.getElementById);</span><br><span class="line">var getId = document.getElementById; //这样就不会再报错</span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2018/05/29/field&&closure/">变量的作用域和闭包</a>
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<ul>
<li>什么是闭包?</li>
<li><p>闭包是一个函数,用于捕获作用域内的外部绑定。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">// * @param FACTOR</span><br><span class="line">// * @returns {Function}</span><br><span class="line">//factor是createScaleFunction函数内的变量,却能在该函数返回后仍然使用</span><br><span class="line">//它从高阶函数中return实现"越狱"</span><br><span class="line">function createScaleFunction(FACTOR) {</span><br><span class="line"> var factor = FACTOR;</span><br><span class="line"> return function (array) {</span><br><span class="line"> return array.map(function (item) {</span><br><span class="line"> return item * factor;</span><br><span class="line"> })</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">var scale10 = createScaleFunction(10);</span><br><span class="line">console.log(scale10([1, 2, 3, 4, 5])); //10, 20, 30, 40, 50</span><br><span class="line">var scale2 = createScaleFunction(2);</span><br><span class="line">console.log(scale2([1, 2, 3, 4, 5])); //2,4,6,8,10</span><br></pre></td></tr></table></figure>
<p>// * @returns {Function}</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">//利用闭包封装私有数据</span><br><span class="line">//实现一个自增计数器</span><br><span class="line">function increment() {</span><br><span class="line"> var counter = 0;</span><br><span class="line"> return function () {</span><br><span class="line"> return ++counter;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">// console.log(counter); //error,访问不到</span><br><span class="line">var counter = increment();</span><br><span class="line">console.log(counter()); //1</span><br><span class="line">console.log(counter()); //2</span><br><span class="line">console.log(counter()); //3</span><br></pre></td></tr></table></figure>
<p>// * 实现bind函数</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">function.prototype.bind = function () {</span><br><span class="line"> var args = [].slice.apply(arguments);</span><br><span class="line"> var context = args.shift();</span><br><span class="line"> var self = this; //保存原函数</span><br><span class="line"> return function () {</span><br><span class="line"> var args2 = args.concat([].slice.apply(arguments));</span><br><span class="line"> return self.apply(context, args2);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">var func = function (a, b, c, d) {</span><br><span class="line"> console.log(this.name); //21cm</span><br><span class="line"> console.log([a, b, c, d]); //3,4,1,2</span><br><span class="line">}.bind({name: '21cm'}, 3, 4);</span><br><span class="line">func(1, 2);</span><br></pre></td></tr></table></figure></li>
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<a class="article-title" href="/2018/05/29/applicative/">函数式编程之 Applicative编程</a>
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<h3 id="Applicative编程-将函数作为参数传递给另外一个函数-并且调用它。"><a href="#Applicative编程-将函数作为参数传递给另外一个函数-并且调用它。" class="headerlink" title="Applicative编程: 将函数作为参数传递给另外一个函数,并且调用它。"></a>Applicative编程: 将函数作为参数传递给另外一个函数,并且调用它。</h3><p>最常见的有数组的 map、reduce、filter函数等。</p>
<ul>
<li>例一: 实现一个函数,查找出某个数组中所有数字,可能实现一个findNumber方法,<br>那如果后面又有查找字母、查找大于10的数字…这些需求呢? 难道每个需求都要添加一个函数?<br>可以使用高阶函数,将一个条件判断的函数当做参数传递到一个通用的find函数中!</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">function find(array, pred/!*function*!/) {</span><br><span class="line"> var result = [];</span><br><span class="line"> array.forEach(function (item, index) {</span><br><span class="line"> if (pred(item)) {</span><br><span class="line"> result.push(item);</span><br><span class="line"> }</span><br><span class="line"> })</span><br><span class="line"> return result;</span><br><span class="line"> }</span><br><span class="line">var result = find([1, 2, 3, 4, 'a', 'c', 5], function (item) {</span><br><span class="line"> // return item >= 0 && item <= 9; //查找数字 1,2,3,4,5</span><br><span class="line"> return item >= 'a' && item <= 'c'; //查找字母 a,c</span><br><span class="line"> });</span><br><span class="line">console.log(result); 1,2,3,4</span><br></pre></td></tr></table></figure>
<ul>
<li>例一的代码还可以写成如下形式,通过返回函数来定制不同行为</li>
<li>@param pred</li>
<li>@returns {Function}</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">function find(pred) {</span><br><span class="line"> return function (array) {</span><br><span class="line"> var result = [];</span><br><span class="line"> array.forEach(function (item, index) {</span><br><span class="line"> if (pred(item)) {</span><br><span class="line"> result.push(item);</span><br><span class="line"> }</span><br><span class="line"> })</span><br><span class="line"> return result;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"> // * 1.查找数组中的数字</span><br><span class="line">var findNumber = find(function (x) {</span><br><span class="line"> return x >= 0 && x <= 9</span><br><span class="line">});</span><br><span class="line">console.log(findNumber([1, 2, 3, 'a', 'v', 'b', 4, 'kkk', 'rrr'])); //1,2,3,4</span><br><span class="line"></span><br><span class="line">// * 2.查找数组中除数字外的元素</span><br><span class="line">var findNotNumber = find(function (x) {</span><br><span class="line"> return !(x >= 0 && x <= 9);</span><br><span class="line">})</span><br><span class="line">console.log(findNotNumber([1, 2, 3, 'a', 'v', 'b', 4, 'kkk', 'rrr'])); // a,v,b,kkk,rrr</span><br><span class="line"></span><br><span class="line">// * 3.查找数组中的小写字母</span><br><span class="line"></span><br><span class="line">var findLowerCaseLetters = find(function (x) {</span><br><span class="line"> return x >= 'a' && x <= 'z'</span><br><span class="line">});</span><br><span class="line">console.log(findLowerCaseLetters([1, 2, 3, 'a', 'v', 'b', 4])); a,v,b</span><br></pre></td></tr></table></figure>
<ul>
<li>例二: 写一个函数,来判断传入的参数是不是某种类型的数据<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">var isType = function (Type) {</span><br><span class="line"> return function (data) {</span><br><span class="line"> return Object.prototype.toString.call(data) === '[object ' + Type + ']';</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">// * 1.判断是不是Number类型数据</span><br><span class="line">var isNumber = isType('Number');</span><br><span class="line">console.log(isNumber(0)); //true</span><br><span class="line">// * 2.判断数据是不是字符串类型</span><br><span class="line">var isString = isType('String'); //true</span><br><span class="line">console.log(isString('123')); //true</span><br><span class="line">console.log(isString(123)); //false</span><br></pre></td></tr></table></figure></li>
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