Bootstrap Input
Bootstrap 支持所有的 HTML5 输入类型: text, password, datetime, datetime-local, date, month, time, week, number, email, url, search, tel, 以及 color。注意：: 如果 input 的 type 属性未正确声明，输入框的样式将不会显示。
以下实例使用两个 input 元素，一个是 text，一个是 password ：
实例：
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap4 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" >
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
<script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
<script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
</head>
<body>
<div class="container">
<h2>表单控件: input</h2>
<p>以下实例使用两个 input 元素，一个是 text，一个是 password ：</p>
<form>
<div class="form-group">
<label for="usr">用户名:</label>
<input type="text" class="form-control" id="usr">
</div>
<div class="form-group">
<label for="pwd">密码:</label>
<input type="password" class="form-control" id="pwd">
</div>
</form>
</div>
</body>
</html>
尝试一下
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