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select.js
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select.js
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'use strict';
function $ (str) {
var arr = str.replace(/^\s+|\s+$/g, '').split(/\s+/);
var aParent = [document];
var aChild = [];
for (var i = 0, len = arr.length; i < len; i++) {
aChild = getByStr(aParent, arr[i]);
aParent = aChild;
}
return aChild;
}
function getByStr(aParent,str){
var aChild = [];
for(var i=0;i<aParent.length;i++){
switch(str.charAt(0)){
case '#':
var obj = document.getElementById(str.substring(1));
aChild.push(obj);
break;
case '.':
var aEle = getByClass(aParent[i],str.substring(1));
for(var j=0;j<aEle.length;j++){
aChild.push(aEle[j]);
}
break;
default:
if(/\w+\:\w+(\(\d+\))?/.test(str)){
var aStr = str.split(/\:|\(|\)/);
var aEle = aParent[i].getElementsByTagName(aStr[0]);
switch(aStr[1]){
case 'first':
aChild.push(aEle[0]);
break;
case 'last':
aChild.push(aEle[aEle.length-1]);
break;
case 'eq':
for(var j=0;j<aEle.length;j++){
if(j==aStr[2]){
aChild.push(aEle[j]);
}
}
break;
case 'lt':
for(var j=0;j<aStr[2];j++){
aChild.push(aEle[j]);
}
break;
case 'gt':
for(var j=parseInt(aStr[2])+1;j<aEle.length;j++){
aChild.push(aEle[j]);
}
break;
case 'even':
for(var j=0;j<aEle.length;j+=2){
aChild.push(aEle[j]);
}
break;
case 'odd':
for(var j=1;j<aEle.length;j+=2){
aChild.push(aEle[j]);
}
break;
}
}else if(/\w+\[\w+=\w+\]/.test(str)){
var aStr = str.split(/\[|=|\]/);
var aEle = aParent[i].getElementsByTagName(aStr[0]);
for(var j=0;j<aEle.length;j++){
if(aEle[j].getAttribute(aStr[1])==aStr[2]){
aChild.push(aEle[j]);
}
}
}else if(/\w+\.\w+/.test(str)){
var aStr = str.split('.');
var aEle = aParent[i].getElementsByTagName(aStr[0]);
var re = new RegExp('\\b'+aStr[1]+'\\b');
for(var j=0;j<aEle.length;j++){
if(aEle[j].className.search(re)){
aChild.push(aEle[j]);
}
}
}else{
var aEle = aParent[i].getElementsByTagName(str);
for(var j=0;j<aEle.length;j++){
aChild.push(aEle[j]);
}
}
break;
}
}
return aChild;
}
function getByClass (oParent, aClass) {
if (oParent.getElementsByClassName) {
return oParent.getElementsByClassName(aClass);
} else {
var result = [];
var aEle = oParent.getElementsByTagName('*');
var re = new RegExp('\\b'+sClass+'\\b');
for (var i = 0, len = aEle.length; i < len; i++) {
if (aEle[i].className.search(re)) {
result.push(aEle[i]);
}
}
return result;
}
}