<script>
/*
* 洗牌
*/
function getRandomPlayCard(m){
var array1=new Array(m);
for(var i=0;i<m;i++){
var rnd=Math.floor(Math.random()*(i+0.99999))
array1[i]=array1[rnd];
array1[rnd]=i;
}
return array1;
};
/*
* 快速排序，按某個(gè)屬性，或按“獲取排序依據(jù)的函數(shù)”，來(lái)排序.
* @method soryBy
* @static
* @param {array} arr 待處理數(shù)組
* @param {string|function} prop 排序依據(jù)屬性，獲取
* @param {boolean} desc 降序
* @return {array} 返回排序后的新數(shù)組
*/
var sortBy =function (arr, prop, desc){
var props=[],
ret=[],
i=0,
len=arr.length;
if(typeof prop=='string') {
for(; i<len; i++){
var oI = arr[i];
(props[i] = new String(oI && oI[prop] || ''))._obj = oI;
}
}
else if(typeof prop=='function') {
for(; i<len; i++){
var oI = arr[i];
(props[i] = new String(oI && prop(oI) || ''))._obj = oI;
}
}
else {
throw '參數(shù)類型錯(cuò)誤';
}
props.sort();
for(i=0; i<len; i++) {
ret[i] = props[i]._obj;
}
if(desc) ret.reverse();
return ret;
};
for(var i=0;i<1000;i++){
document.write('<div>a'+i+'</div>')
}
var els=document.getElementsByTagName('div');
var cards=getRandomPlayCard(els.length);
var randomEls=[];
for(var i=0,len=cards.length;i<len;i++) randomEls[cards[i]]=els[i];//按洗出的牌來(lái)洗元素?cái)?shù)組
alert(['總數(shù)：',randomEls.length,'打亂順序后: ',randomEls[0].innerHTML,randomEls[randomEls.length-1].innerHTML]);
var d0=new Date();
var elsSorted=sortBy(randomEls,function(el){return el.sourceIndex+100000000;})
alert(['總數(shù)：',elsSorted.length,'排序耗時(shí)：',new Date()-d0,'重新排序后: ',elsSorted[0].innerHTML,elsSorted[elsSorted.length-1].innerHTML]);
</script>