js的变量的定义的讲解
1、常用的javascript脚本
jquery dojo ext js
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()
+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
//document.write("我爱你");
//这是声明变量
var i = 2;
var i,j;
var notNull = true;
m = 10;
/*alert(j);//结果是undefined
alert(i);
alert(m);
alert(k);//这样会报错k没有定义
*/
var s = 3;
//alert(s);
s = false;
//alert(s);
//全局变量、局部变量
var globe = false;//全局变量
function test()
{
var global = 'asd';//局部变量
i = 123;//这是全局变量
document.write(globe+"<br/>");
document.write(global+"<br/>");
}
document.write(globe+"<br/>");
document.write(global);
</script>
//这是引入外部的js
<!-- <script type="text/javascript" src="js/hello.js"></script>-->
</head>
<body>
<a href="#" onclick="test();">点击</a>
</body>
</html>