引导|浮动实用程序示例

原文:https://www . geesforgeks . org/bootstrap-float-utilities-with-examples/

Bootstrap 为我们提供了一系列的 float 实用程序类，允许一个元素左右浮动，或者使其不浮动，就像 CSS float 属性一样。除此之外，bootstrap 还提供了响应的浮动类，使元素根据视口大小浮动。

引导断点:

  • sm: 视口大于 576px。
  • md: 视口大于 768px。
  • lg: 视口大于 992px。
  • xl: 视口大于 1200px。

普通浮动类

  • float-left: It makes the element to float left on all viewport sizes.

    示例:

    ```html <!DOCTYPE html>   

                        h1.head{         color: green;         text-align: center;       }       div.box{         height: 150px;         width: 150px;         border: 1px dashed black;         background: #E3F2FD;         margin: 20px;       }     

        

    Hello, world!           
          

    GeeksForGeeks

          

            Prepare for the Recruitment drive of product         based companies like Microsoft, Amazon, Adobe         etc with a free online placement preparation         course. The course focuses on various MCQ's         & Coding question likely to be asked in the         interviews & make your upcoming placement         season efficient and successful.       

                           ```

    输出:

    bootstrap-float-left

  • float-right: It makes the element to float right on all viewport sizes.

    示例:

    ```html <!DOCTYPE html>

      

               h1.head{         color: green;         text-align: center;       }       div.box{         height: 150px;         width: 150px;         border: 1px dashed black;         background: #E3F2FD;         margin: 20px;       }     

        

    Hello, world!           
          

    GeeksForGeeks

          

            Prepare for the Recruitment drive of product         based companies like Microsoft, Amazon, Adobe         etc with a free online placement preparation         course. The course focuses on various MCQ's         & Coding question likely to be asked in the         interviews & make your upcoming placement         season efficient and successful.       

                           ```

    输出: bootstrap-float-right

  • float-none: It makes the element not to float across all viewport sizes. Example:

    ```html <!DOCTYPE html>

      

                    h1.head{         color: green;         text-align: center;       }       div.box{         height: 150px;         width: 150px;         border: 1px dashed black;         background: #E3F2FD;         margin: 20px;       }     

        

    Hello, world!           
          

    GeeksForGeeks

          

            Prepare for the Recruitment drive of product         based companies like Microsoft, Amazon, Adobe         etc with a free online placement preparation         course. The course focuses on various MCQ's         & Coding question likely to be asked in the         interviews & make your upcoming placement         season efficient and successful.       

                           ```

    输出: bootstrap-float-none

响应浮动类:

班级 描述
左浮动 它使元素在大于 576px (sm)的视口中向左浮动。
右浮动 它使元素在大于 576px (sm)的视口中向右浮动。
浮动-sm-无 它使元素不会在大于 576px (sm)的视口中浮动。
浮动-纵向-左侧 它使元素在大于 768px (md)的视口中向左浮动。
浮动-纵向-右侧 它使元素在大于 768px (md)的视口中向右浮动。
浮动-MD-无 它使元素不会在大于 768px (md)的视口中浮动。
浮动-LG-左侧 它使元素在大于 992px (lg)的视口中向左浮动。
浮动-LG-右侧 它使元素在大于 992px (lg)的视口中向右浮动。
浮动-LG-无 它使元素不会在大于 992px (lg)的视口中浮动。
左浮动-xl 它使元素在大于 1200px (xl)的视口中向左浮动。
浮动-XL-右侧 它使元素在大于 1200px (xl)的视口中向右浮动。
浮点-XL-无 它使元素不会在大于 1200px (xl)的视口中浮动。

示例: float-md-right。

<!DOCTYPE html>

<html>
  <head>
    <!-- Custom CSS -->
    <style>
      h1.head{
        color: green;
        text-align: center;
      }
      div.box{
        height: 150px;
        width: 150px;
        border: 1px dashed black;
        background: #E3F2FD;
        margin: 20px;
      }
    </style>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>
    <div class="container"><!-- For making div reponsive -->
      <h1 class="head">GeeksForGeeks</h1>

      <!-- float-md-right, bootstrap class -->
      <div class="float-md-right box">

      </div>

      <p>
        Prepare for the Recruitment drive of product
        based companies like Microsoft, Amazon, Adobe
        etc with a free online placement preparation
        course. The course focuses on various MCQ's
        & Coding question likely to be asked in the
        interviews & make your upcoming placement
        season efficient and successful.
      </p>

    </div>

    <!-- Link JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
  </body>
</html>

输出:

[https://media.geeksforgeeks.org/wp-content/uploads/float-md-right.webm](https://media.geeksforgeeks.org/wp-content/uploads/float-md-right.webm)

Note: We can use more that one float utility class simultaneously to get the desired results. For example we may set float-right and float-md-left, to float element to right on viewport size less than 768px and float to left when viewport is greater than 768px.

示例:

<!DOCTYPE html>

<html>
  <head>
     <!-- Custom CSS -->
    <style>
      h1.head{
        color: green;
        text-align: center;
      }
      div.box{
        height: 150px;
        width: 150px;
        border: 1px dashed black;
        background: #E3F2FD;
        margin: 20px;
      }
    </style>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>
    <div class="container"><!-- For making div reponsive -->
      <h1 class="head">GeeksForGeeks</h1>

      <!-- float-right float-md-left, bootstrap classes -->
      <div class="float-right float-md-left box">

      </div>

      <p>
        Prepare for the Recruitment drive of product
        based companies like Microsoft, Amazon, Adobe
        etc with a free online placement preparation
        course. The course focuses on various MCQ's
        & Coding question likely to be asked in the
        interviews & make your upcoming placement
        season efficient and successful.
      </p>

    </div>

    <!-- Link JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
  </body>
</html>

输出:

[https://media.geeksforgeeks.org/wp-content/uploads/float-utility.webm](https://media.geeksforgeeks.org/wp-content/uploads/float-utility.webm)

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