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July 2, 2014 04:25
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使用new 操作符function里面到底发生了什么?
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当我们在使用new操作符,函数(构造函数)中到底放生了什么? | |
1.创建一个空对象 | |
2.让空对象的__proto__(这个不同浏览器不同)成员指向了构造函数对象prototype成员对象 | |
3.将构造函数对象的this指针替换成空对象,然后再调用Base函数 | |
4.返回this对象 | |
例如 | |
function Foo(name){ | |
this.name = name; | |
} | |
new Foo("bar"); | |
1.var obj = {}; | |
2.obj.__proto__ = Foo.prototype; | |
3.Foo.call(obj); | |
... ... | |
4.return this; | |
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