new

2019独角兽企业重金招聘Python工程师标准>>>

First, it creates a new empty object. (Already done for you here.)

Next, it sets the new object’s .__proto__ property to match the prototype property of the function being invoked.

Finally, the operator invokes the function and passes the new object as the “this” reference.

var myObj = {};
myObj.__proto__ = MyObject.prototype;
MyObject.call(myObj);

转载于:https://my.oschina.net/rickliu/blog/228516