js生成不重复的随机数

 1 //产生不重复的随机数
 2 function createRandom(num ,min ,max)
 3 {
 4     let arr=[],res=[],newArr;
 5     for (let i=min;i<max;i++) {
 6         arr.push(i);
 7     }
 8     newArr=Object.assign([],arr);
 9     for(let item=0;item<arr.length;item++) {
10         res.push(newArr.splice(Math.floor(Math.random() * arr.length), 1)[0]);
11     }
12     res.length = num;
13     return res;
14 }