引导表格结构
要在Bootstrap中创建表单，
将角色 表单添加到父<form>元素。
用类.form-group将标签和控件包装在<div>中。这是最佳间距所需的。
向所有文本<input>，<textarea>和<select>元素添加.form-control类。
您可以尝试运行以下代码来创建表单-
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Forms</title>
<meta name = "viewport" content = "width=device-width, initial-scale = 1">
<link rel = "stylesheet" href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<script src = "https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</head>
<body>
<form role = "form">
<div class = "form-group">
<label for = "name">Full Name</label>
<input type = "text" class = "form-control" id = "name" placeholder = "Enter Full Name">
<label for = "subject">Subject</label>
<input type = "text" class = "form-control" id = "name" placeholder = "Add Selected Subject">
</div>
<div class = "form-group">
<label for = "inputfile">File input</label>
<input type = "file" id = "inputfile">
<p class = "help-block">Example block-level help text here.</p>
</div>
<div class = "checkbox">
<label><input type = "checkbox"> Notification about our products</label>
</div>
<button type = "submit" class = "btn btn-default">Submit</button>
</form>
</body>
</html>