js定义类的方法示例【ES5与ES6】

<script>function Point(x,y){  this.x=x;  this.y=y;}Point.prototype.toString=function(){  return '('+this.x+', '+this.y+')';}var point=new Point(1,2);console.log(point);</script>

<script>class Point{   constructor(x,y){    this.x=x;    this.y=y;    }    toString(){     return '('+this.x+', '+this.y+')';    }}let point=new Point(3,4);console.log(point);</script>