<script> <BR>//1、基本类型 <BR>var x = 123; <BR>var y = "abc"; <BR>var z = true; <BR>//alert(typeof x);//number <BR>//alert(typeof y);//string <BR>//alert(typeof z);//boolean <BR>//2、引用类型，类型是object <BR>var arr = new Array(); <BR>var date = new Date(); <BR>var str = new String("abc"); <BR>//alert(typeof arr);//object <BR>//alert(typeof date);//object <BR>//alert(typeof str);//object <BR>//3、对象类型，可以理解为javascript中的类的模拟是通过function来实现的 <BR>alert(typeof Array);//function <BR>alert(typeof Date);//function <BR>alert(typeof String);//function <BR></script>