var arr = [12,31,11,3,88];
var contrast = 99999999999;
var iIndex = -1;
for(var i=0;i<arr.length;i++){
    if(arr[i]<contrast){
        contrast = arr[i];
        iIndex = i;
    }
}
alert('最小值是:'+contrast+',索引是:'+iIndex);

 

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