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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