<script type="text/javascript">
            var name;
            var name="吴彦祖";
            
            var name1="陈冠希";
            
            //不推荐
            name2="柯震东";
            
            var age=20;
            var sex=‘男‘;
            var isStudent=true;
            var pi=3.14;
            var addr;
//变量赋值后，获取变量的数据类型
//输出到页面的body中
            document.write("name:"+typeof name+"<br/>");
            document.write("age:"+typeof age+"<br/>");
            document.write("sex:"+typeof sex+"<br/>");
            document.write("isStudent:"+typeof isStudent+"<br/>")
            document.write("pi"+typeof pi+"<br/>");
            document.write("addr"+typeof addr);