初学者遇到一些问题，onsubmit不起作用

一个小哥哥 2018-03-22 02:35:09

<%@ 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 'jsfrom.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">

<style >
.errSpan{
color:red;
font-style:italic;
}
</style>
<script src="js/my.js"></script>
<script >
function check(){
var uername=$("username").value;
if(username==""){
$("nameErrSpan").innerHTML=("用户名不能为空");
return false;

}
var passwd=$("passwd").value;
if(passwd==""){
$("pwdErrSpan").innerHTML=("密码不为空！");
return true;
}

}

</script>
</head>

<body>

<form action="next.jsp" method="post" onsubmit="return check()">
用户名<input type="text" id="username" name="username" onfocus="$('pwdErrSpan').innerHTML=('')"/>
<span id="nameErrSpan" class="errSpan"></span><br/>
密码<input type="text" id="passwd" name="passwd" onfocus="$('pwdErrSpan').innerHTML=('')"/>
<span id="pwdErrSpan" class="errSpan"></span><br/>

<input type="submit" value="提交" >
</form>
</body>
</html>

不输入东西提交还是会传输道next.jsp

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var $ = function(id) {
	return document.getElementById(id);
};

function check() {
	var username = $("username").value;
	if (username == "") {
		$("nameErrSpan").innerHTML = ("用户名不能为空");
		return false;

	}
	var passwd = $("passwd").value;
	if (passwd == "") {
		$("pwdErrSpan").innerHTML = ("密码不为空！");
		return false;
	}
	return true;
}