js 原型链总结

Posted 2021-11-28 zou1234

举个例子

function Test() {
    this.name = "吕布";
    this.age = "35";
    this.skill_1 = function () {
        console.log(2)
    };
    this.skill_2 = function () {
        console.log(3)
    }
}

Test.prototype.skillPrototype1 = function () {
    console.log(‘skillPrototype1‘)
};
Test.prototype.skillPrototype2 = function () {
    console.log(‘skillPrototype2‘)
};
Test.prototype.haha = "1111";

var test = new Test();

console.log(test);

//继承
function Data() {
    Test.apply(this)
}
Data.prototype = Test.prototype;

var newData = new Data();
console.log(newData);

// prototype 构造器原型上定义方法和属性
// __proto__ 指向构造函数原型上
// constructor 指向构造器

//通过这样一层一层的指向最顶端Object 构成原型链