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首页 > 解决方案 > 如何使用 Bootstrap 中的可见类使文本出现在特定视口上？

html - 如何使用 Bootstrap 中的可见类使文本出现在特定视口上？

问题描述

我刚开始学习 Boots 陷阱，所以我正在尝试制作一个响应式页面，其中一些 div 只会出现在特定的视口上。对不同的 DIV 使用了 visible-xs、visible-sm、visible-md 和 visible-lg 但是当我调整屏幕大小时它不起作用？

这是 HTML 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 -->
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
        <link rel="stylesheet" href="css/btcss.css"/>
        <title>Bootstrap</title>
    </head>
    <body>
        <h1>This is My first Bootstrap layout</h1>
        <div class="container">
            <div class="row">
                <div class="col-md-6 col-lg-3">
                <div class="visible-xs visible-sm">Extra Small and Small Screen</div>
                <div class="visible-md">Medium Screen</div>
                <div class="visible-lg">Large Screen</div>
            </div>
                <div class="col-md-6 col-lg-3">
                    <div class="visible-xs visible-sm">DIV for Xtra small and small Screens</div>
                    <div class="visible-md">DIV for Middle Screens</div>
                    <div class="visible-lg">DIV for Large Screens</div>
                </div>
                <div class="col-md-6 col-lg-3">
                    <div class="visible-xs visible-sm">DIV for Xtra small and small Screens</div>
                    <div class="visible-md">DIV for Middle Screens</div>
                    <div class="visible-lg">DIV for Large Screens</div>
                </div>
                <div class="col-md-6 col-lg-3">
                    <div class="visible-xs visible-sm">DIV for Xtra small and small Screens</div>
                    <div class="visible-md">DIV for Middle Screens</div>
                    <div class="visible-lg">DIV for Large Screens</div>
                </div>
            </div>
        </div>

        <!-- Optional JavaScript -->
        <!-- jQuery first, then Popper.js, then Bootstrap JS -->
        <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
        <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
    </body>
</html>

标签： htmlbootstrap-4

解决方案

使用显示类，您可以执行可见的大小而不是可见的大小，不可见的大小。

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<h1>This is My first Bootstrap layout</h1>
<div class="container">
  <div class="row">
    <div class="col-md-6 col-lg-3">
      <div class="d-sm-block d-md-none">Extra Small and Small Screen</div>
      <div class="d-none d-md-block d-lg-none">Medium Screen</div>
      <div class="d-none d-lg-block d-xl-none">Large Screen</div>
    </div>
    <div class="col-md-6 col-lg-3">
      <div class="d-sm-block d-md-none">DIV for Xtra small and small Screens</div>
      <div class="d-none d-md-block d-lg-none">DIV for Middle Screens</div>
      <div class="d-none d-lg-block d-xl-none">DIV for Large Screens</div>
    </div>
    <div class="col-md-6 col-lg-3">
      <div class="d-sm-block d-md-none">DIV for Xtra small and small Screens</div>
      <div class="d-none d-md-block d-lg-none">DIV for Middle Screens</div>
      <div class="d-none d-lg-block d-xl-none">DIV for Large Screens</div>
    </div>
    <div class="col-md-6 col-lg-3">
      <div class="d-sm-block d-md-none">DIV for Xtra small and small Screens</div>
      <div class="d-none d-md-block d-lg-none">DIV for Middle Screens</div>
      <div class="d-none d-lg-block d-xl-none">DIV for Large Screens</div>
    </div>
  </div>
</div>

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