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/**
* ¸¸ÀàPolygon:¶à±ßÐÎ
* @param {Object} sides
*/
function Polygon(sides) {
this.sides = sides;
this.setSides = function(s) {this.sides=s;}
}
/**
* ×ÓÀàTriangle:Èý½ÇÐÎ
*/
function Triangle() {
this.tempfun = Polygon;//¸¸ÀàÒýÓø³Öµ¸ø×ÓÀàµÄÒ»¸öÊôÐÔtempfun
this.tempfun(3);//µ÷ÓÃ
delete this.tempfun;//ɾ³ý¸ÃÊôÐÔ
this.getArea = function(){};
}
//new¸ö¶ÔÏó
var tri = new Triangle();
console.log(tri.sides);//¼Ì³ÐµÄÊôÐÔ
console.log(tri.setSides);//¼Ì³ÐµÄ·½·¨
console.log(tri.getArea);//×ÔÓеķ½·¨
//ȱµãÊǶÔÓÚTriangleµÄʵÀý¶ÔÏóÓÃinstanceofΪ¸¸ÀàPolygonʱÊÇfalse
console.log(tri instanceof Triangle);//true
console.log(tri instanceof Polygon);//false

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function Triangle() {
Polygon.call(this,3);//call·½Ê½µ÷Óø¸Àà
this.getArea = function(){};
}
function Triangle() {
Polygon.apply(this,[3]);//apply·½Ê½µ÷Óø¸Àà
this.getArea = function(){};
}
function Triangle() {
var temp = new Polygon(3);//new·½Ê½µ÷Óø¸Àà
for(atr in temp)//È«²¿¸´ÖƸø×ÓÀà
this[atr] = temp[atr];

this.getArea = function(){};
}

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