Bootstrap實現前端登入頁面帶驗證碼功能完整示例
阿新 • • 發佈：2020-03-29
本文例項講述了Bootstrap實現前端登入頁面帶驗證碼功能。分享給大家供大家參考，具體如下：
Bootstrap有自定義的驗證碼樣式，在前端頁面可以直接使用，他的css、js在使用前要在開頭引入
上程式碼：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<!-- 告訴瀏覽器網頁所識別的檔案型別及語言型別 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>登入</title>
<!-- 讓一些搜尋引擎搜尋到你的網頁 -->
<meta name="description" content="">
<meta name="keywords" content="">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="external nofollow" >
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
<script src="tool.js"></script>
<style>
.carousel-inner img {
width:100%;
height:100%;
}
.jumbotron {
margin-top: 10px;
margin-bottom: 0px;
padding-top: 10px;
}
#demo {
width:100%;
height: 500px;
}
.row {
height: 264px;
}
.left {
float: left;
width: 70%;
}
.right {
float: left;
width: 30%;
}
.card {
height: 340px;
}
.carousel-inner {
height: 500px;
}
.footer {
position: absolute;
bottom: 0;
height: 60px;
}
.jumheight1 {
height: 100px;
}
.jumheight2 {
height: 100px;
}
.end_name {
margin-bottom: 5px;
}
.footer2 {
padding-top: 210px;
text-align: center;
}
.test{
margin-bottom: 75px;
}
.carousel-control-prev,.carousel-control-next{
bottom: 120px;
}
</style>
</head>
<body>
<div>
<form class="form active" method="post" action="{:url('index/Login/doLogin')}">
<div class="jumbotron text-info bg-light jumheight1">
<h1>圖書閱讀網</h1>
<p>一個免費的圖書網站</p>
</div>
<!-- 輪播圖 -->
<!-- 指示符 -->
<div class="row">
<div class="left">
<div id="demo" class="carousel slide " data-ride="carousel">
<ul class="carousel-indicators">
<li data-target="#demo" data-slide-to="0" class="active"></li>
<li data-target="#demo" data-slide-to="1"></li>
<li data-target="#demo" data-slide-to="2"></li>
</ul>
<!-- 輪播圖片 -->
<div class="carousel-inner">
<div class="carousel-item active">
<img src="http://static.runoob.com/images/mix/img_fjords_wide.jpg">
</div>
<div class="carousel-item">
<img src="http://static.runoob.com/images/mix/img_nature_wide.jpg">
</div>
<div class="carousel-item">
<img src="http://static.runoob.com/images/mix/img_mountains_wide.jpg">
</div>
</div>
<!-- 左右切換按鈕 -->
<a href="#demo" rel="external nofollow" rel="external nofollow" class="carousel-control-prev" data-slide="prev">
<span class="carousel-control-prev-icon"></span>
</a>
<a href="#demo" rel="external nofollow" rel="external nofollow" class="carousel-control-next" data-slide=next>
<span class="carousel-control-next-icon"></span>
</a>
</div>
</div>
<div class="right">
<!-- 登陸視窗 -->
<div class="card">
<div class="card-header">
使用者登陸
</div>
<div class="card-body">
<form>
<table style="border-collapse: separate;/*border-spacing: 30px 20px;*/">
<tr>
<td class="margin-top:10">
<label>電話號碼：</label>
</td>
<td>
<input type="text" name="username" pattern="^\d{11}" id="username" class="form-control" placeholder="請輸入您的電話號碼">
<!-- <input type="text" name="username" pattern="^\d{11}" id="username" class="form-control" placeholder="請輸入您的電話號碼" required> -->
</td>
</tr>
<tr>
<td>
<label>密碼:</label>
</td>
<td>
<input type="password" name="password" id="password" class="form-control" placeholder="請輸入您的密碼">
</td>
</tr>
<tr>
<td>
<label for="captcha" class="test">驗證碼:</label>
</td>
<td>
<input type="text" name="captcha" class="form-control " id="captcha" placeholder="請輸入驗證碼">
<!-- 點選驗證碼更換 -->
<br>
<div class="code-img"><img height="50px" src="{:captcha_src()}" alt="captcha" onClick="this.src='{:captcha_src()}?'+Math.random()"/></div>
</td>
</tr>
</table>
<div class="footer">
<button type="submit" class="btn btn-primary" >登陸</button>
<button type="submit" class="btn btn-secondary " formaction="{:url('index/Repassword/index')}" >忘記密碼？</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<script>
fieldTest();
</script>
</body>
</html>
效果圖：
這裡還有輪播圖，點選驗證碼時會更新
可以使用線上HTML/CSS/JavaScript程式碼執行工具：http://tools.jb51.net/code/HtmlJsRun測試上述程式碼執行效果。
PS：關於bootstrap佈局，這裡再為大家推薦一款本站的線上視覺化佈局工具供大家參考使用：
線上bootstrap視覺化佈局編輯工具：
http://tools.jb51.net/aideddesign/layoutit
希望本文所述對大家基於bootstrap的程式設計有所幫助。