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高效JavaScript 68诫
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<p>将《编写高质量JavaScript代码的68个有效方法》书中提到的68个方法分享给大家。</p>
<h3 id="让自己习惯JavaScript"><a href="#让自己习惯JavaScript" class="headerlink" title="让自己习惯JavaScript"></a>让自己习惯<code>JavaScript</code></h3><ol>
<li>了解你使用的JavaScript版本</li>
<li>理解JavaScript的浮点数</li>
<li>当心隐式的强制转换</li>
<li>原始类型优于封装对象</li>
<li>避免对混合类型使用<code>==</code>运算符</li>
<li>了解分号插入的局限</li>
<li>视字符串为16位的代码单元序列</li>
</ol>
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<h1 id="2017年书单（15-12）"><a href="#2017年书单（15-12）" class="headerlink" title="2017年书单（15/12）"></a>2017年书单（15/12）</h1><p>去年计划读12本书，很显然没有完成任务。2017年继续“12本书计划”。</p>
<p>“人丑就该多读书”其实只是前半句，后半句是“不丑多读书也没坏处”。</p>
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<h2 id="什么是Promise"><a href="#什么是Promise" class="headerlink" title="什么是Promise"></a>什么是<strong>Promise</strong></h2><p><strong>Promise</strong>的核心理念是一个异步操作的结果，<strong>Promise</strong>包含两部分</p>
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<li><code>[[PromiseStates]]</code></li>
<li><code>[[PromiseValue]]</code></li>
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<p><strong>Promise</strong>状态三种可能：</p>
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<li><code>pending</code>: 悬而未决</li>
<li><code>resolved</code>: 决定</li>
<li><code>rejected</code>: 拒绝</li>
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CSS单位全解
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<h2 id="对于css单位的认识"><a href="#对于css单位的认识" class="headerlink" title="对于css单位的认识"></a>对于css单位的认识</h2><p>对于网页布局的单位，只知道<code>px</code>是仅仅不够的，还需要知道其他几个比较常见的单位，特别是css3推出的一些新的度量单位。</p>
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<p>在开发过程中经常会涉及跨域问题，解决跨域问题的方案也有很多种，接下来就来梳理一下前端跨域的常用方法。</p>
<h2 id="同源策略"><a href="#同源策略" class="headerlink" title="同源策略"></a>同源策略</h2><p>何为<strong>跨域</strong>，<strong>跨域</strong>是相对于同源而言。协议、域名和端口均相同，则为<strong>同源</strong>。<br>浏览器通过<strong>同源策略</strong>限制从一个源加载的文档或脚本与来自另一个源的资源进行交互。这是一个用于隔离潜在恶意文件的关键的安全机制，摘抄自<a href="https://developer.mozilla.org/zh-CN/docs/Web/Security/Same-origin_policy" target="_blank" rel="external">MDN</a>。</p>
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