css3 flex布局实现平均分配元素的示例代码

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本文主要介绍了css3 flex布局实现平均分配元素，给自己留个笔记，也分享给大家，具体如下：

例子一：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
    <title>flex 布局</title>
  <style> 
    *{
      padding:0;
      margin:0;
    }
    body,html{
      height: 100vh;
      min-width: 800px;
    } 
    .container{
      display:flex;
      flex-wrap:wrap;
      display: -webkit-flex; /* Safari */
    }
    .container>.item{
      border: 1px solid black;
      flex:1; 
      height:100px;
      background: #abcdef;
    }
  </style>
</head>
<body>
  <div class="container">  
    <div class="item"></div>
    <main class="item"></main>
    <div class="item"></div>
  </div>
</body>
</html>

例子二：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
    <title>flex 布局</title>
  <style> 
    *{
      padding:0;
      margin:0;
      box-sizing: border-box;
    }
    body,html{
      width: 100%;
      height: 100vh;
      min-width: 800px;
      display:flex;
      display: -webkit-flex; /* Safari */
      justify-content: center;
      align-items: center;
    } 
    .container{
      width: 300px;
      height: 300px;
      display:flex;
      display: -webkit-flex; /* Safari */
      flex-wrap: wrap;
    }
    .container>.item{
      flex:0 0 33.3%; 
      height:100px;
      background: #abcdef;
      border: 1px solid red;
    }
    main{
      flex:0 0 33.3%; 
      height:100px;
      background-color: #ccc;
      border: 1px solid red;
    }
  </style>
</head>
<body>
  <div class="container">  
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
  </div>
</body>
</html>

flex:0 0 33.3% 相当于flex-basis:33.3%，使每一个元素的宽度占外层容器的33.3%，因此每行最多能够排开三个元素。

flex-wrap:wrap 表示每行填满时会自动换行。

例子三：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
    <title>flex 布局</title>
  <style> 
    *{
      padding:0;
      margin:0;
      box-sizing: border-box;
    }
    body,html{
      width: 100%;
      height: 100vh;
      min-width: 800px;
      display:flex;
      display: -webkit-flex; /* Safari */
      justify-content: center;
      align-items: center;
    } 
    .container{
      width: 300px;
      height: 300px;
      margin: 50px;
      display:flex;
      display: -webkit-flex; /* Safari */
      flex-wrap: wrap;
      justify-content: space-between;
    }
    .container>.item{
      flex:0 0 30%; 
      height:90px;
      background: #abcdef;
      border: 1px solid red;
    }
    main{
      flex:0 0 30%; 
      height:90px;
      background-color: #ccc;
      border: 1px solid red;
    }
  </style>
</head>
<body>
  <div class="container">  
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
    <div class="item">left</div>
    <main>main</main>
    <div class="item">right</div>
  </div>
</body>
</html>