限制用户不允许输入中文字符
程序员文章站
2022-06-14 20:18:07
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应用JavaScript提供的excape()方法，该方法返回一个包含了charstring内容的字符串值，通过判断转换后的字符串是否包含“%u”,即可知道字符串中是否包含中文字符‘
<%@ 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>限制用户不允许输入中文</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 language="javascript">
function checkCN(str){
if (escape(str).indexOf("%u")<0){//indexOf()方法查找字符串是否包含"\u" ,如果不包含返回-1
return true;
} else {
return false;
}
}
function check(){
var userName = document.getElementById("username").value;
if(userName==""){
alert("请输入用户名！");
document.getElementById("username").focus();
return;
}
if(!checkCN(userName)){
alert("用户名不允许包含中文字符！");
document.getElementById("username").focus();
return;
}
document.getElementById("myform").submit();
}
</script>
<style type="text/css">
table{
font-size: 13px;
font-family: 楷体;
color:navy;
}
input{
font-size: 13px;
font-family: 楷体;
color:navy;
}
font{
font-size: 12px;
font-family: 楷体;
color:orangered;
}
.style1{
width: 500px;
height: 160px;
}
</style>
</head>
<body>
<fieldset class="style1"><legend>用户注册</legend>
<form action="" id="myform">
<table align="center">
<tr>
<td>用户名：</td>
<td>
<input type="text" id="username">
</td>
</tr>
<tr>
<td>密码：</td>
<td>
<input type="password" id="pwd"/>
</td>
</tr>
<tr>
<td>确认密码：</td>
<td>
<input type="password" id="pwd1"/>
</td>
</tr>
<tr>
<td>性别：</td>
<td>
<input type="radio" name="sex" id="man" value="m" checked="checked" />男
<input type="radio" name="sex" id="woman" value="f" />女
</td>
</tr>
<tr>
<td>年龄：</td>
<td>
<input type="text" id="age"/>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="button" value="注 册" "check()">
</td>
</tr>
</table>
</form>
</fieldset>
</body>
</html>
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