<script>/** 手写apply方法   * */Function.prototype.myApply = function (context, args) {console.log(this, 'sss')//fnconst key = Symbol()context[key] = thiscontext[key](...args)delete context[key]return context[key]}const obj = {name: 'zs',age: 18}function fn (a, b) {console.log(this)console.log(a + b, 'aaa')return a + b}const res = fn.myApply(obj, [1, 2])console.log('返回值为', res);</script>