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>