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-
<!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>