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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta http-equiv="X-UA-Compatible" content="IE=edge">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>03.原型链_属性问题</title>
- </head>
- <body>
- <!--
- 1、读取对象的属性值时：会自动到原型链中查找
- 2、设置对象的属性值时：不会查找原型链，如果当前对象中没有此属性，
- 直接添加此属性并设置其值
- 3、方法一般定义在原型中，属性一般通过构造函数定义在对象本身上
- -->
- <script>
- function Fn() {
- }
- Fn.prototype.a = 'xxx'
- var fn1 = new Fn()
- console.log(fn1.a) //xxx
- console.log(fn1)
- var fn2 = new Fn()
- fn2.a = 'yyy'
- console.log(fn1.a) //xxx
- console.log(fn2.a) //yyy
- console.log(fn2)
- function Person(name,age){
- this.name = name
- this.age = age
- }
- Person.prototype.setName = function(name){
- this.name = name
- }
- var p1 = new Person('孙悟空',22)
- p1.setName('二师兄')
- console.log(p1)
- console.log(p1.name) //二师兄
- console.log(p1.age) //22
- var p2 = new Person('白骨精',22)
- p2.setName('唐僧')
- console.log(p2)
- console.log(p1.__proto__===p2.__proto__) //true
- </script>
- </body>
- </html>
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