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Comments (5)

naVuppe avatar naVuppe commented on June 8, 2024
  1. 创建一个空对象
  2. this指向这个空对象
  3. 执行构造函数代码,给this添加属性和方法
  4. 把this作为返回值返回
    function Qwer(name){
        this.name = name;
        this.age = 18;
        this.fn = function(){
            console.log(this.name);
        }
    }
    const qwe = new Qwer('pink');
    qwe.fn();

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zxdfe avatar zxdfe commented on June 8, 2024
  1. 创建一个空对象
  2. this指向这个空对象
  3. 执行构造函数代码,给this添加属性和方法
  4. 把this作为返回值返回
    function Qwer(name){
        this.name = name;
        this.age = 18;
        this.fn = function(){
            console.log(this.name);
        }
    }
    const qwe = new Qwer('pink');
    qwe.fn();

手写new不是指的这个哈

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A-Lonely-GEEK avatar A-Lonely-GEEK commented on June 8, 2024
    function myNew(fn, ...args) {
        let obj = new Object()
        obj.__proto__ = fn.prototype

        let res = fn.call(obj, ...args)

        if (res && (typeof res === 'object' || typeof res === 'function')) return res
        else return obj
    }

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szgyFE avatar szgyFE commented on June 8, 2024

手写一个new是直接用原型继承吗??

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ttizzyf avatar ttizzyf commented on June 8, 2024

1、创建一个空对象
2、构造函数中的this指向这个对象
3、执行构造函数,给空对象赋值
4、返回这个对象

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