<%@ 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>
<script type="text/javascript">
function changerand(obj){
obj.src="images/image.jsp"+Math.random();
}
</script>
</head>
<body>
<center>
<img src="images/image.jsp" id=randimg>
<a href="#" onclick="changerand(document.getElementById('randimg'));">看不清,换一个</a>
</center>
</body>
</html>
为什么我的验证码点击看不清楚会没图片了呢?我换成 href=“javascript:void(0)”;也是不动呀,也会没有的。什么原因,很纠结?
<%
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>
<script type="text/javascript">
function changerand(obj){
obj.src="images/image.jsp"+Math.random();
}
</script>
</head>
<body>
<center>
<img src="images/image.jsp" id=randimg>
<a href="#" onclick="changerand(document.getElementById('randimg'));">看不清,换一个</a>
</center>
</body>
</html>
为什么我的验证码点击看不清楚会没图片了呢?我换成 href=“javascript:void(0)”;也是不动呀,也会没有的。什么原因,很纠结?
<%
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 'Test.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">
function changerand(obj){
obj.src="images/image.jsp"+Math.random();
}
</script>
</head>
<body>
验证码:<input type="text" id="code" value=""/><img id="safecode1" src="images/image.jsp" style="width: 90px;height: 20px;" />
<a href="#" onclick="javascript:this.setAttribute('src','images/image.jsp?'+Math.random())">看不清楚</a>
<img src="images/image.jsp" id=randimg>
<a href="javascript:void(0);" onclick="changerand(document.getElementById('randimg'));">看不清,换一个</a>
</body>
</html>
下面这个也是不点击看不清楚后就没有反应?
onclick="changerand(document.getElementById('randimg'));"等同于 onclick="changerand(this);"obj.src="images/image.jsp"+Math.random();
这个什么意思
要知道Math.random();可是个小于1的随机数
楼主的意思是不是向image.jsp传个参数,参数是1到10的随机数
如果这样的话
obj.src="images/image.jsp"+Math.random(); 改成
obj.src="images/image.jsp?idx="+(int)(10*Math.random()+1)
在image.jsp中
request.getParmaeter("idx");
就可以接收到传来的参数