代码:
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">`
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <!-- Bootstrap CSS -->
<title>Bootstrap</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<!--custom css-->
<link rel="stylesheet" href="stylesheet.css">
</head>
<body>
<section id="cover">
<div id="cover-caption">
<div class="container">
<div class="col-sm-10 col-sm-offset-1">
<h1>Welcome to Bootstrap 4.0 !</h1>
<p>This is the platform that was created by twitter and is used in every website today</p>
<form action="" class="form-inline">
<div class="form-group"> <label class="sr-only">Name</label> <input type="text" class="form-control
form-control-lg" placeholder="Tanveer">
</div>
<div class="form-group"> <label class="sr-only">Email</label> <input type="text" class="form-control
form-control-lg" placeholder="tanveer@example.com ">
</div>
<button type="submit" class="btn btn-success btn-lg">Submit</button>
</form>
</div>
</div>
</div>
</section>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark navbar-full"
id="nav-main"> <a class="navbar-brand" href="#">Bootstrap 4.0</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span> </button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form> </div> </nav>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="js/bootstrap.min.js""></script>
</body>
</html>
最佳答案
将 html 标记更改为居中的一种基本且简单的方法是使用对齐属性:
<form align="center">
This sentence will be in the center!
</div>
请尝试更改此代码:
<form action="" class="form-inline" >
<div class="form-group"> <label class="sr-only">Name</label> <input type="text" class="form-control form-control-lg" placeholder="Tanveer">
<div class="form-group"> <label class="sr-only">Email</label> <input type="text" class="form-control form-control-lg" placeholder="tanveer@example.com "> Submit
</div>
</div>
</form>
收件人:
<form action="" class="form-inline" align="center">
<div class="form-group"> <label class="sr-only">Name</label> <input type="text" class="form-control form-control-lg" placeholder="Tanveer">
<div class="form-group"> <label class="sr-only">Email</label> <input type="text" class="form-control form-control-lg" placeholder="tanveer@example.com "> Submit
</div>
</div>
</form>
另一种方法是在您的 CSS 文件中添加 "text-align: center;"。
关于javascript - 无法让我的表格居中对齐，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49338153/