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window.onload = function (){
var arr = [34,7,3,11,20,40,13,5];
function quickSort(arr){
if(arr.length <= 1){
return arr;
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var num = arr[Math.ceil(arr.length/2 - 1) ];
var arrL = [];
var arrC = arr.splice(num,1);
var arrR = [];
for(var i = 0; i < arr.length; i++){
if(arr[i] < num){
arrL.push( arr[i] );
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else if( arr[i] > num ){
arrR.push( arr[i] )
}else{
arrC.push(arr[i]);
}
}
return quickSort( arrL ).concat( arrC , quickSort( arrR ) );
}
console.log(quickSort( arr ));
}
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原文：http://www.cnblogs.com/mayufo/p/4458519.html