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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- /**
- * 所有构造函数下都有两个属性：constructor 和 prototype
- * 原型的特点：
- * 1.方法 写在原型下
- * 2.属性 写在构造函数下
- *
- */
- function Person(name,age) {
- this.name = name;
- this.age = age;
- Person.prototype.eat = function() {
- console.log("青草蛋糕")
- }
- }
- let p1 = new Person('LiLi',20);
- console.log(p1);
- p1.eat();
- /**
- * 1.令当前子函数的原型 是 当前实例化的父函数
- * 2.父对象.call 修改this指向
- */
- function Child(name,age,a) {
- Person.call(this,name,age);
- this.a =a;
- }
- Child.prototype = new Person();
- let aa = new Child('HAHA',10,'篮球');
- console.log(aa)
- aa.eat();
- </script>
- </body>
- </html>
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