javascript 的面向对象特性参考

javascript 的面向对象特性参考,标签：javascript视频教程,javascript教程下载,http://www.xuehuiba.com
  
//alert("c1.area1 "+c1.area());   
//alert("c1.area2 "+c1.area2());   
//alert("c2.area1 "+c2.area());   
//alert("c2.area2 "+c2.area2());   
  
////////////////////////define: SubCircle //////////////////   
function SubCircle(x, y, r) {   
this.x = x;   
this.y = y;   
this.r = r;   
}   
SubCircle.prototype = new Circle(0);   
SubCircle.prototype.PI = 100;   
SubCircle.prototype.move2 = function(x, y) { this.x = x; this.y = y;}   
SubCircle.prototype.area = function() { return this.PI*this.r*this.r*this.r; }   
  
//// test   
sc = new SubCircle(0,0,2);   
  
alert(sc.area());

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