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flex容器与项目
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flex容器与项目

flex术语，容器，项目，主轴，交叉轴
容器：display:flex做一个标签或div盒子里声明。
项目：flex标签或div下的子标签.
主轴：子标签在容器里的排列方向。

交叉轴。子标签在容器里垂直排列方向。

下面演示了，两次使用flex的效果，
第一次使用在<body>标签里，column 让两个项目垂直居中排列
第二次，在div class="container"里使用，
做一个两端对齐，看起来像导航条的部件。
内部项目垂直居中两端对齐，
项目文字居中对齐。
三，垂直排列项目box 只是展示了column的排列方式，内容默认左对齐。
flex

  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>flex布局技术案例</title>
  8.     <style>
  9.         *{
  10.             margin:0;
  11.             padding:0;
  12.             box-sizing:border-box;
  13.         }
  14.         html{
  15.             font-size: 100px;
  16.         }
  17.         body{
  18.             font-size: 0.16rem;
  19.             display: flex;
  20.             flex-flow:column wrap;
  21.             align-items:center;
  23.         }
  24.         .container{
  25.             display:flex;
  26.             width: 12rem;
  27.             height: 1rem;
  28.             flex-flow:row nowrap;
  29.             place-content:space-between;
  30.             place-items:center;
  31.             background-color: cornflowerblue;
  32.         }
  33.         .container > .item{
  34.             background:#ccc;
  35.             width: 1rem;
  36.             text-align: center;
  37.             flex:0 1 auto;
  39.         }
  40.         .box{
  41.             background-color: aqua;
  42.             width: 12rem;
  43.         }
  45.     </style>
  46. </head>
  47. <body>
  48.     <div class="container">
  49.         <div class="item">item-1</div>
  50.         <div class="item">item-2</div>
  51.         <div class="item">item-3</div>
  52.         <div class="item">item-4</div>
  53.         <div class="item">item-5</div>
  54.         <div class="item">item-6</div>
  55.         <div class="item">item-7</div>
  56.         <div class="item">item-8</div>
  58.     </div>
  59.     <div class="box">我是另外一个box,我因为body里的flex设置而居中显示<br><br></div>
  61. </body>
  62. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：完成的不错，继续加油
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