JavaScript JS生成一个随机且不重复的数组

JavaScript JS生成一个随机且不重复的数组

下列代码中的参数num为要生成数组的长度，from为起始值，to为末尾值

    console.log(selectRandom(3, 0, 10))function selectRandom (num, from, to) {let arr = [];let json = {};let needNum;if (from - to >= 0) {console.log(111)return '起始值要小于末尾值'}if (to - from == to) {needNum = parseInt(to) + 1;} else {needNum = to - from;}if (num > needNum) {return} else {while (arr.length < num) {let ranNum = il(Math.random() * needNum);if (!json[ranNum]) {json[ranNum] = 1;arr.push(ranNum)}}return arr;}}