<html>
<head>
<title>
wodeweb
</title>
</head>
<body>
<script type="text/javascript">
//Object.prototype.color=null; 可去可不去
Object.prototype.shift=function()
{
//this.color=null;必须去掉否则错误
alert(this.color+(this===Object));//this不是Object
}
var redCar=new Object();
redCar.color="红色";
var blueCar=new Object();
blueCar.color="蓝色";
redCar.shift();
blueCar.shift();
/*function Car()
{
this.color=null; //可去可不去
this.shift=function()
{
alert(this.color+"汽车");
}
}
var redCar=new Car();
redCar.color="红色";
redCar.shift();*/
</script>
</body>
</html>