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/**
* ¸¸ÀàPolygon:¶à±ßÐÎ
*/
function Polygon(sides) {
this.sides = sides;
}
Polygon.prototype.setSides = function(s) {this.sides=s;}
/**
* Triangle Èý½ÇÐÎ
* @param {Object} base µ×
* @param {Object} height ¸ß
*/
function Triangle(base,height) {
Polygon.call(this,3);//¸´ÖƸ¸ÀàÊôÐÔ¸ø×Ô¼º
this.base = base;
this.height = height;
}
Triangle.prototype = new Polygon();//¸´ÖƸ¸Àà·½·¨¸ø×Ô¼º
Triangle.prototype.getArea = function(){ //×îºó¶¨Òå×Ô¼ºµÄ·½·¨
return this.base*this.height/2;
}
//new¸ö¶ÔÏó
var tri = new Triangle(12,4);
console.log(tri.sides);//¼Ì³ÐµÄÊôÐÔ
console.log(tri.setSides);//¼Ì³ÐµÄ·½·¨
console.log(tri.base);//×ÔÓÐÊôÐÔ
console.log(tri.height);//×ÔÓÐÊôÐÔ
console.log(tri.getArea);//×ÔÓз½·¨
//instanceof²âÊÔ£¬±íÃ÷ÕýÈ·µÄά»¤ÁË"is a"µÄ¹ØÏµ
console.log(tri instanceof Triangle);//true£¬±íÃ÷¸Ã¶ÔÏóÊÇÈý½ÇÐÎ
console.log(tri instanceof Polygon);//true£¬±íÃ÷Èý½ÇÐÎÒ²ÊǶà±ßÐÎ

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