js中object对象的constructor属性用法

javascript中constructor属性用来引用初始化该对象的构造函数：示例：

<script language="javascript" type="text/javascript">
//constructor属性用来引用初始化该对象的构造函数
 function Bus(price,type){
	this.price = price;
	this.type = type;
 }
 var bus = new Bus(10000,"small");
 document.write("输出结果："+bus.constructor);
 //判断bus是否为实例
 if (typeof bus == "object" && bus.constructor == Bus)
 {
	alert("bus为Bus的一个实例");
 }
</script>