各种手写源码 ​

function throttle() {
    
}

function

function new2(Constructor, ...args) {
  let obj = Object.create(null);
  obj.__proto__ = Constructor.prototype;
  let result = Constructor.apply(obj, args);
  return typeof result === 'object' ? result : obj;
}

function new3() {
    let obj = {},
    Constructor = Array.prototype.shift.call(arguments)
    var F = function(){}
    F.prototype = Constructor.prototype
    obj = new F()
    var result = Constructor.apply(obj, arguments)
    returb typeof result === 'object' ? result : obj
}

function create(obj) {
    function F() {}
    F.prototype = obj;
    return new F()
}

function deepClone(source, storage = new WeakMap()) {
    // 针对基本数据类型
    if (typeof source !== 'object' || source === null) {
        return source
    }
    // 是否是日期
    if (source.constructor === Date) {
        return new Date(source)
    }
    // 是否是正则
    if (source.constructor === RegExp) {
        return new RegExp(source)
    }
    // 是否是数组
    let target = source instanceof Array ? [] : {}
    // 循环引用 返回存储的引用数据
    if (storage.has(source)) return storage.get(source)
    // 开辟存储空间设置临时存储值
    storage.set(source, target)
    // 是否包含 Symbol 类型
    let isSymbol = Object.getOwnPropertySymbols(source)
    // 包含 Symbol 类型
    if (isSymbol.length) {
        isSymbol.forEach((item) => {
            if (typeof source[item] === 'object') {
                target[item] = deepClone(source[item], storage);
                return
            }
            target[item] = source[item]
        })
    }
    // 不包含 Symbol
    for(let key in source) {
        if (source.hasOwnProperty(key)) {
            target[key] = typeof source[key] === 'object' ? deepClone(sourcep[key], storage) : source[key]
        }
    }
    return target;
}

function myInstanceof(left, right) {
    if (typeof left !== 'object' || left === null) return false;
    let proto = Object.getPrototypeOf(left);
    while (true) {
        if (proto == null) return false;
        if (proto == right.prototype) return true;
        proto = Object.getPrototypeOf(proto);
    }
}