How to implement quick sort

Quick sort requires:

 //找一个基准点//建立两个数组，分别存储在左右两边的数组//利用递归处理左右两组；//将结果合并起来

Implementation code:

function quickSort(arr){
    if(arr.length<=1) return arr;    
    var num=Math.floor(arr.length/2);    
    var Value=arr.splice(num,1);    
    var left=[];    
    var right=[];    
    for(var i= 0,len=arr.length;i<len;i++){
        arr[i]<Value?left.push(arr[i]):right.push(arr[i]);
    }    return quickSort(left).concat(Value,quickSort(right))
}
console.log(quickSort([12, 5, 37,55,11,21 ,6, 22, 40]));

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