js 引用
<html>
<head>
<script type="text/javascript">
// js 引用
var item = new Array("one","two");
var itemRef = item;
//item和itemRef指向同一个对象（Array）的指针
item.push("three");
alert(item.length==itemRef.length);
itemRef.push("three");
alert(item.length==itemRef.length);
itemRef = new Array("one","two","three");
alert(item == itemRef);
var it = "test";
var itRef = it;
item += "ing";//创建新对象
alert(it!=ifRef);
</script>
<body>
</body>
</head>
</html>