JS练习_登录验证

效果预览：

源码演示：

login.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <link rel="stylesheet" type="text/css" href="../css/Login.css" />
    <script>
        function checkUserName() { //验证用户名
            var fname = document.myform.username.value;
            if (fname.length != 9) {
                alert("账号输入错误，请重新输入！");
                return false;
            } else {
                return true;
            }
        }
    </script>
</head>

<body>
    <div id="login">
        <h1>Login</h1>
        <form name="myform" method="post" action="index2.html" onsubmit="return checkUserName()">
            <input type="text" required="required" placeholder="用户名" name="u" id="username"></input>
            <input type="password" required="required" placeholder="密码" name="p"></input>
            <div class="btn">
                <button class="but">注册</button>
                <button class="but" type="submit" onclick="checkUserName()">登录</button>
            </div>

        </form>
    </div>

</body>

</html>

Login.css

html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-style: sans-serif;
}

body {
    width: 100%;
    height: 100%;
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    /* background-color: #4A374A; */
    /* background-color: #FF69B4; */
    background-image: url("../imgs/bgImage.jpg");
}

#login {
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -150px 0 0 -150px;
    width: 300px;
    height: 300px;
}

#login h1 {
    color: #fff;
    text-shadow: 0 0 10px;
    letter-spacing: 1px;
    text-align: center;
}

h1 {
    font-size: 2em;
    margin: 0.67em 0;
}

input {
    width: 278px;
    height: 18px;
    margin-bottom: 10px;
    outline: none;
    padding: 10px;
    font-size: 13px;
    color: #fff;
    /* text-shadow: 1px 1px 1px; */
    border-top: 1px solid lightpink;
    border-left: 1px solid lightpink;
    border-right: 1px solid lightpink;
    border-bottom: 1px solid lightpink;
    border-radius: 4px;
    background-color: lightpink;
}

.btn {
    position: relative;
    display: flex;
}

.but {
    width: 300px;
    min-height: 20px;
    display: block;
    background-color: skyblue;
    border: 1px solid skyblue;
    color: #fff;
    padding: 9px 14px;
    font-size: 15px;
    line-height: normal;
    border-radius: 5px;
    margin: 0;
    flex: 1
}
posted @ 2021-12-11 20:16  博客zhu虎康  阅读(145)  评论(0)  编辑  收藏  举报