问题遇到的现象和发生背景
问题相关代码，请勿粘贴截图
运行结果及报错内容
我的解答思路和尝试过的方法
尝试过将if注销掉，他还是会跳转页面。
我想要达到的结果
使用正则表达式匹配用户名合不合法；‘’
<script type="javascript" src="../../static/script/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(function () {
$("#sub_btn").click(function () {//绑定注册按钮
var usernameText=$("#username").val();
var usernamePath=/^\w{5,12}$/;
if (!usernamePath.test(usernameText)) {
$("span.errorMsg").text("用户名不合法")
return false;
}
$("span.errorMsg").text("") ;
})
})
</script>
//完整代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>尚硅谷会员注册页面</title>
<script type="javascript" src="../../static/script/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(function () {
$("#sub_btn").click(function () {
var usernameText=$("#username").val();
var usernamePath=/^\w{5,12}$/;
if (!usernamePath.test(usernameText)) {
$("span.errorMsg").text("用户名不合法")
return false;
}
$("span.errorMsg").text("") ;
})
})
</script>
<link type="text/css" rel="stylesheet" href="../../static/css/style.css" >
<style type="text/css">
.login_form{
height:420px;
margin-top: 25px;
}
</style>
</head>
<body>
<div id="login_header">
<img class="logo_img" alt="" src="../../static/img/logo.gif" >
</div>
<div class="login_banner">
<div id="l_content">
<span class="login_word">欢迎注册</span>
</div>
<div id="content">
<div class="login_form">
<div class="login_box">
<div class="tit">
<h1>注册尚硅谷会员</h1>
<span class="errorMsg"></span>
</div>
<div class="form">
<form action="regist_success.html">
<label>用户名称：</label>
<input class="itxt" type="text" placeholder="请输入用户名" autocomplete="off" tabindex="1" name="username" id="username" />
<br />
<br />
<label>用户密码：</label>
<input class="itxt" type="password" placeholder="请输入密码" autocomplete="off" tabindex="1" name="password" id="password" />
<br />
<br />
<label>确认密码：</label>
<input class="itxt" type="password" placeholder="确认密码" autocomplete="off" tabindex="1" name="repwd" id="repwd" />
<br />
<br />
<label>电子邮件：</label>
<input class="itxt" type="text" placeholder="请输入邮箱地址" autocomplete="off" tabindex="1" name="email" id="email" />
<br />
<br />
<label>验证码：</label>
<input class="itxt" type="text" style="width: 150px;" id="code"/>
<img alt="" src="../../static/img/code.bmp" style="float: right; margin-right: 40px">
<br />
<br />
<input type="submit" value="注册" id="sub_btn" />
</form>
</div>
</div>
</div>
</div>
</div>
<div id="bottom">
<span>
尚硅谷书城.Copyright ©2015
</span>
</div>
</body>
</html>
