<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.error{
color: red;
}
</style>
</head>
<body>
<form action=""></form>
<p>
<label for="username">用户名</label>
<input type="text" id="username" name="username">
<span class="error"></span>
</p>
<p>
<label for="pwd">密码</label>
<input type="password" id="pwd" name="pwd">
<span class="error"></span>
</p>
<p>
<input type="submit" id="b1" value="登录">
</p>
<script src="jquery-3.3.1.min.js"></script>
<script>
$("#b1").click(function () {
var flag=true;
$(".error").text("");
var $username=$("#username");
var $pwd=$("#pwd");
if ($username.val().length===0){
$username.next().text("用户名不能为空");
flag=false;
}
if ($pwd.val().length===0){
$pwd.next().text("密码不能为空！");
flag=false;
}
return flag;
})
</script>
</body>
</html>
jQuery自定义登录
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转载自blog.csdn.net/miaoqinian/article/details/80581809
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