ES6 访问函数

'use strict' ;
class Polygon {
   constructor(height, width) {
      this.h = height;
      this.w = width;
   }
   test() {
      console.log("The height of the polygon: ", this.h) ;
      console.log("The width of the polygon: ",this. w) ;
   }
}

//creating an instance  
var polyObj = new Polygon(10,20);
polyObj.test();