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朱凤丽
``` function isNumber(number) { return Object.prototype.toString.call(number) == '[object Number]' } function isString(string) { return Object.prototype.toString.call(string) == '[object String]' } function isArray(array) { return Object.prototype.toString.call(array) == '[object Array]' } function myIndexOf(target,...
``` // 在data长度的数组中，随机取出num个不重复的数据 let randomResult = (data, num) => { console.time() let res = []; for (let i = 0; i < data.length; i++) { // 获取数组的下标 let index =...