How to get random numbers without repetition in jquery

Jquery method to obtain non-repeating random numbers: first define an array to store random numbers; then limit the range by lengths; then use the "parseInt(Math.random() * arrLen);" method to generate within the range Data; finally remove duplicate values.

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The operating environment of this tutorial: windows7 system, jquery3.2.1 version, This method works for all brands of computers.

Jquery method of obtaining non-repeating random numbers:

JQ obtaining non-repeating random numbers - custom range

The code is as follows:

//获取不重复随机数 function getRandom(lengths) { var arr = [];//存放随机数的数组 var arrLen = lengths;//用来限制范围 for(var i=0; i<4; i++){ var radomNum = parseInt(Math.random() * arrLen);//生成范围内的数据数 if(arr.indexOf(radomNum) == -1){ //indexOf返回值为-1表示数组中没有和新随机数重复的值 arr.push(radomNum); }else{ //有重复值i--，不添加重复的值到数组中，并再循环一次 i--; } } console.log(arr); return arr; }

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