一段代码让我很困惑？

[Java_xujunjie]

function Polygon(iSides) {
this.sides = iSides;

if (typeof Polygon._initialized == "undefined") {

Polygon.prototype.getArea = function () {
return 0;
}
Polygon._initialized = true;
}
}

function Triangle(iBase, iHeight) {
Polygon.call(this, 3);
this.base = iBase;
this.height = iHeight;

if (typeof Triangle._initialized == "undefined") {

Triangle.prototype = new Polygon();
Triangle.prototype.getArea = function () {
return 0.5 * this.base * this.height;
};
Triangle._initialized = true;
}
}



//这里的this代表的是什么对象 还有这段代码错在什么地方。 本人JS刚学的菜鸟 求各位大牛 解释清楚点
Polygon.call(this, 3);
this.base = iBase;
this.height = iHeight;

[java_age]

Polygon.call(this, 3);----Polygon
this.base = iBase;----Triangle
this.height = iHeight;----Triangle

个人理解，LZ可以测试下。

[hch126163]

自己调试

[三石-gary]

自己调试下。。