1.为什么return false没能阻止页面跳转，只有把return false放进每个if语句中页面才能不跳转
2.password和repwd都是jQuery对象，为什么可以使用==比较，js才用的是==比较，哪里有写过jQuery可以用==比较呢
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>尚硅谷会员注册页面</title>
<link type="text/css" rel="stylesheet" href="../../static/css/style.css" >
<script type="text/javascript" src="../../static/script/jquery-1.7.2.js"></script>
<style type="text/css">
.login_form{
height:420px;
margin-top: 25px;
}
</style>
<script type="text/javascript">
$(function () {
$("#sub_btn").click(function () {
var username = $("#username").val();
var password = $("#password").val();
var repwd = $("#repwd").val();
var email = $("#email").val();
var Exp = /\w{5,12}/;//\w表示任意字母、数字、下划线
if(!Exp.test(username)){
$(".errorMsg").text("用户名不合法");
}
if(!Exp.test(password)){
$(".errorMsg").text("密码不合法");
}
if (password == repwd){
$(".errorMsg").text("两次密码输入不一致");
}
return false;
});
});
</script>
</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">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>
