function Shape(){
Shape.prototype.toString = function(){
return 'i am a shape';
};
var radius = 1;
function Circle(){
this.r = radius * 100;
radius = 2;
this.getRadius = function(){
return this.r;
};
Circle.getRadius = function(){
return 300;
};
}
Circle.prototype = new Shape;
Circle.prototype.getRadius = function(){
return 400;
};
Circle.getRadius = function(){
return 500;
};
Circle.prototype.toString = function(){
return 'i am a circle';
};
var c = new Circle();
alart(c.getRadius());
alart(c);
}
输出的是啥