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排序算法

选择排序:
原理:
  循环(1)所有项,拟定当前项为最小项,循环(2)当前项后面所有项和当前项进行对比,
如果小于拟定最小项,让拟定最小项等于当前循环项,从而可以找到后面的最小项,然后让当前循环项和最小项对调。

var ary=[2,34,5,6,2,2,34,7654,123,324];
const selectSort=arr=>{
    let len=arr.length,
        minIndex,temp;
    for(let i=0;i<len-1;i++){
        minIndex=i;
        for(let j=i+1;j<len;j++){
             if(arr[j]<arr[minIndex]){
                minIndex=j;
             }
        }       
        temp=arr[i];
        arr[i]=arr[minIndex];
        arr[minIndex]=temp;
    }
    return arr;
}

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