JavaScript如何定义类的属性成员

function Car(color,w,h){  //通过this来定义--类似java的 public成员  this.color = color;  this.width = w;  this.height = h;  //通过this来定义--类似java的 private成员  this.area = function(){return w*h);}//examplevar c = new Car(red,4,5);alert(c.color+c.width+c.height);var area =  c.area();alert("area="+area);