javascript调用对象属性形式

   	   	 
function init(){
	 	var Point = function(){
			var x;
			var y;
			this.setX = function(x){
				this.x = x;
			}
			this.setY = function(y){
				this.y=y;
			}
		 }
		
		var point1 = new Point();
        point1.setX("121.00");
		point1.setY("31.00");
		
		alert("point1>> x:"+point1.x+"y:"+point1.y);
		
		var point2 = new Point();
        point2.x = "122.00";
		point2.y = "32.00";
		alert("point2>> x:"+point2.x+"y:"+point2.y);
		
		var point3 = new Point();
		point3['x']="123.00";
		point3['y'] = "33.00";
		point3['address'] = "china";
		alert("point3>> x:"+point3['x']+"y:"+point3['y']+"address:"+point3['address']);
							
	 }