javaScript基本知识

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <title>JavaScript基本结构</title>
        <meta http-equiv="keywords" content="enter,your,keywords,here" />
        <meta http-equiv="description" content="A short description of this page." />
        <meta http-equiv="content-type" content="text/html; charset=gb2312" />
        <script type="text/javascript" src="js/hello.js"></script>
        <script type="text/javascript">
            //alert("Hello JavaScript ！");
            //document.writeln("Hello JavaScript !");
            var num1;
            num1=25;
            var num2=13;
            var Num1=250; //JavaScript区分大小写
            //alert(num1+","+num2+","+Num1);
            var flag=true;
            var height=180.5;
            var name="tom";
            hobby="game";
            var num3;
            var num4=null;
            var today=new Date();
            var nums=new Array(13,25,250);
            //alert(hobby);
            /*alert(typeof(num1));
            alert(typeof(flag));
            alert(typeof(height));
            alert(typeof(name));
            alert(typeof(num3));
            alert(typeof(num4));
            alert(typeof(today));
            alert(typeof(nums)); */

            //switch选择结构
            var weekday="星期日";
            switch(weekday){
                case "星期一":
                    alert("新的一周又开始了，上坟一样的心情！");
                    break;
                case "星期二":
                case "星期三":
                case "星期四":
                    alert("好好工作，好好学习");
                    break;
                case "星期五":
                    alert("明天就放假了");
                    break;
                default:
                    alert("睡到自然醒！");
                    break;
            }

            //定义一个数组
            var names=new Array("tom","alice","mike","jone sun");
            //alert(names[2]);
            //alert(names.length);
            names.sort();
            names.reverse();
            for(var i=0;i<names.length;i++){
                document.writeln(names[i]);
            }
            document.writeln("<br/>");

            //foreach循环
            for(var i in names){
                document.writeln(names[i]);
            }

            var username=prompt("请输入您的姓名：","");
            alert(username);
        </script>
    </head>
    <body>
        <p>
            This is my XHTML page.
        </p>
        <input type="button" value="点我" onclick="alert('我是被点了才出来的')" /><br/>
        <a href="javascript:alert('嘿嘿')">嘿嘿</a>

    </body>
</html>

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