如何在嵌套行上设置断点 Bootstrap

Question

我目前正在学习制作响应式网站。当屏幕尺寸改变时，我对如何做内容的断点感到困惑。这是我想要做的：

以下代码仅适用于桌面尺寸：

             <div className="row wrapper-about">
                <div className="col-lg-6 col-md-6 col-6">                  
                    <div className="img-box">
                      <img src="/pp1.jpg" alt="foto.jpg" />
                    </div>
                </div>
               <div className="col-lg-6 col-md-6 col-6">
                  <div className="row">
                      <div className="desc-container">
                        <h5 className="text-justify">
                          Content 2
                        </h5>
                      </div>
                  </div>
                  <div className="row desc2-d">
                      <span>
                        Content3                   
                      </span>
                  </div>
                </div>
             </div>

Answer 1

对于 Bootstrap 网格，您必须将 C3 div 放置两次。一次位于第一行的第二列（用于桌面视图），另一列位于第一行下方（用于移动视图）；然后根据768px断点切换可见性得到你想要的...

下面的代码片段：

.divC1 {
  border: 5px solid red;
  height: 300px;
}

.divC2 {
  border: 5px solid green;
  height: 150px;
}

.divC3 {
  border: 5px solid yellow;
  height: 150px;
}

@media screen and (max-width:768px) {
  .divC2 {
    height: 300px
  }
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">


<div class="container-fluid">
  <div class="row">

    <div class='col-6 col-sm-6'>
      <div class="row">
        <div class="col-sm-12 divC1"> C1
        </div>
      </div>
    </div>

    <div class='col-6 col-sm-6'>
      <div class="row">
        <div class="col-sm-12 divC2"> C2
        </div>
        <div class="col-sm-12 divC3 d-none d-md-block"> C3
        </div>
      </div>
    </div>

    <div class='col-12 divC3 d-block d-md-none'> C3
    </div>

  </div>
</div>

Answer 2

我认为以下代码会对您有所帮助。

.c1 { height:200px; outline:2px solid red; outline-offset: -5px; } 
 .c2 { height:100px; outline:2px solid green; outline-offset: -5px; }
 .c3 { height:100px; outline:2px solid yellow; outline-offset: -5px; }
 
 @media only screen and (max-width:768px) and (min-width:200px) {  

       .c1 { height:auto; } 
    .c2 { height:auto; }
    .c3 { height:auto;}    

     }

<meta name="viewport" content="width=device-width, initial-scale=1">
  
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    
    
<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6 c1">
C1
</div>
<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6 c2">
C2
</div>

<div class="col-lg-6 col-md-6 col-sm-6 col-xs-12 c3">
C3
</div>

Answer 3

获得此布局的最简单方法（无额外 CSS 或重复标记）是禁用 flexbox 以适应更大的屏幕宽度并使用浮动实用程序：

https://www.codeply.com/go/snVOquHz1k

<div class="container">
    <div class="row d-md-block">
        <div class="col-6 col-md-8 float-left border border-danger c1">
        c1
        </div>
        <div class="col-6 col-md-4 float-left border border-success">
        c2
        </div>
        <div class="col-12 col-md-4 float-left  border border-warning">
        c3
        </div>
    </div> 
</div>

之前回答过类似问题：

如何在嵌套行上设置断点 Bootstrap

How to setup breakpoints on nested rows Bootstrap

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