zwwgoodwill的博客

Promise.all( [ Promise.reject({ code: 500, msg: "服务异常" }), Promise.resolve({ code: 200, list: [] }), Promise.resolve({ code: 200, list: [] }) ].map(p => p.catch(e => e))) .the...

三种实现方式let a = { i: 1, toString: function() { return this.i++; }};let a = new Proxy({}, { i: 1, get: function() { return () => this.i++ } });//数组的 toString 默认调用数...

function deepClone(obj) { function isObject(o) { return (typeof o === "object" || typeof o === "function") && o !== null; } if (!isObject(obj)) { throw new Error("非对象"); } le...

// 创建一个空的新对象// 链接到原型// 绑定this// 返回新对象function _new() { let obj = {}; let [constructor, ...args] = [...arguments]; obj.__proto__ = constructor.prototype; let result = constructor.apply(obj...

instanceof 可以正确的判断对象的类型，因为内部机制是通过判断对象的原型链中是不是能找到类型的 prototype。instanceof 实现如下：function myInstanceof(left, right) { var prototype = right.prototype var left = left.__proto__ while (true) { i...

call实现Function.prototype.newCall = function (context, ...parameter) { if (typeof context === 'object' || typeof context === 'function') { context = context || window } else { context ...