JavaScript prototype ES6 notation

Class point{

 Constructor(xY){This. x= xthis.y = Y;  tostring ({return " (' + this.x Span class= "token operator" >+ + this.y + ") '              /span>            

}

定义“类”的方法的时候，前面不需要加上function这个关键字，直接把函数定义放进去了就可以了。另外，方法之间不需要逗号分隔，加了会报错,类的方法都是写入在phototype中的,

ClassBar{Dostuff() {console.  Log(' stuff '); }}var b = new Bar(); b.  Dostuff() //"stuff" invokes the method of the class and uses the command directly against the class new , exactly as the constructor uses.

ClassPoint{Constructor(){// ...}Tostring(){// ...}Tovalue(){// ...}}//equivalent to Point.prototype = {constructor ( Span class= "token punctuation") {}tostring ({} , tovalue ({},}          

< Span class= "token function" >         

Object.assignMethod makes it easy to add multiple methods to a class at once.

ClassPoint{Constructor(){//... }}object.assign (Point.prototype< Span class= "token punctuation", {tostring ({ }tovalue ({}})  ; 

< Span class= "token function" >         

JavaScript prototype ES6 syntax