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flex基础：flex项目上的三个属性以及利用flex完成移动商城首页的页眉和页脚布局
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flex项目上的三个属性

flex:项目的缩放比例与基准宽度
align-self:单个项目在交叉轴上的对齐方式
order:项目在主轴上排列顺序

  1. <!DOCTYPE html>
  2. <html lang="en">
  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>Document</title>
  8.     <style>
  9.       * {
  10.         box-sizing: border-box;
  11.       }
  12.       :root {
  13.         font-size: 10px;
  14.       }
  15.       body {
  16.         font-size: 1.6rem;
  17.       }
  18.       .container {
  19.         display: flex;
  20.         height: 100vh;
  21.         border: 2px solid #000000;
  22.       }
  23.       .container > .item {
  24.         padding: 3rem;
  25.         /* height: 5rem; */
  26.         /* width: 10rem; */
  27.         background-color: cyan;
  28.         border: 1px solid rosybrown;
  29.         /* flex:项目的缩放比例与基准宽度 */
  30.         /* flex: 放大因子 收缩因子 项目在主轴上的基准宽度 */
  31.         /* 默认,禁止放大,允许收缩,宽度自动 */
  32.         flex: 0 1 auto;
  33.         /* 简写 */
  34.         flex: initial;
  35.         /* 允许放大和收缩 */
  36.         flex: 1 1 auto;
  37.         /* 简写 */
  38.         flex: auto;
  39.         /* 禁止放大和收缩,一般用于PC布局 */
  40.         flex: 0 0 auto;
  41.         /* 简写 */
  42.         flex: none;
  43.       }
  44.       /* 案例,要求第2个项目的宽度是其他项目的两倍 */
  45.       .container > .item:nth-of-type(2) {
  46.         flex: 2 1 auto;
  47.       }
  48.       .container > .item:first-of-type,
  49.       .container > .item:last-of-type {
  50.         flex: 1 1 auto;
  51.       }
  53.       /* align-self:单个项目在交叉轴上的对齐方式 */
  54.       .container > .item:nth-of-type(2) {
  55.         /* 默认拉伸 */
  56.         align-self: stretch;
  57.         /* 起始线 */
  58.         align-self: flex-start;
  59.       }
  60.       .container > .item:first-of-type {
  61.         /* 终止线 */
  62.         align-self: flex-end;
  63.       }
  64.       .container > .item:last-of-type {
  65.         /* 居中 */
  66.         align-self: center;
  67.       }
  68.       /* order:项目在主轴上排列顺序 */
  69.       .container > .item:nth-of-type(2) {
  70.         /* 默认序号越小越靠前,越大越靠后 */
  71.         order: 3;
  72.       }
  73.       .container > .item:first-of-type {
  74.         ordre: 2;
  75.       }
  76.       .container > .item:last-of-type {
  77.         order: 1;
  78.       }
  79.     </style>
  80.   </head>
  81.   <body>
  82.     <div class="container">
  83.       <div class="item">item1</div>
  84.       <div class="item">item2</div>
  85.       <div class="item">item3</div>
  86.     </div>
  87.   </body>
  88. </html>

移动商城首页的页眉和页脚布局

html页面

  1. <!DOCTYPE html>
  2. <html lang="en">
  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.     <link rel="stylesheet" href="static/css/reset.css" />
  8.     <link rel="stylesheet" href="static/icon-font/iconfont.css" />
  9.     <link rel="stylesheet" href="static/css/index.css" />
  10.     <link rel="stylesheet" href="static/css/header.css" />
  11.     <link rel="stylesheet" href="static/css/footer.css" />
  12.     <title>Document</title>
  13.   </head>
  14.   <body>
  15.     <header>
  16.       <!-- 菜单栏 -->
  17.       <div class="caidan iconfont icon-menu"></div>
  18.       <!-- 搜索框 -->
  19.       <div class="search">
  20.         <div class="logo">JD</div>
  21.         <div class="fangda iconfont icon-search"></div>
  22.         <input type="text" class="words" value="保险箱" />
  23.       </div>
  24.       <!-- 登录按钮 -->
  25.       <a href="" class="denglu">登录</a>
  26.     </header>
  27.     <main></main>
  28.     <footer>
  29.       <div>
  30.         <div class="iconfont icon-home"></div>
  31.         <span>主页</span>
  32.       </div>
  33.       <div>
  34.         <div class="iconfont icon-layers"></div>
  35.         <span>分类</span>
  36.       </div>
  37.       <div>
  38.         <div class="iconfont icon-kehuguanli"></div>
  39.         <span>京喜</span>
  40.       </div>
  41.       <div>
  42.         <div class="iconfont icon-shopping-cart"></div>
  43.         <span>购物车</span>
  44.       </div>
  45.       <div>
  46.         <div class="iconfont icon-user"></div>
  47.         <span>未登录</span>
  48.       </div>
  49.     </footer>
  50.   </body>
  51. </html>

初始化

  1. * {
  2.   margin: 0;
  3.   padding: 0;
  4.   box-sizing: border-box;
  5. }
  7. li {
  8.   list-style: none;
  9. }
  10. a {
  11.   color: #7b7b7b;
  12.   text-decoration: none;
  13. }
  15. body {
  16.   background-color: #f6f6f6;
  17. }
  19. html {
  20.   font-size: 10px;
  21. }
  23. @media screen and (min-width: 480px) {
  24.   html {
  25.     font-size: 12px;
  26.   }
  27. }
  29. @media screen and (min-width: 640px) {
  30.   html {
  31.     font-size: 14px;
  32.   }
  33. }
  35. @media screen and (min-width: 720px) {
  36.   html {
  37.     font-size: 16px;
  38.   }
  39. }

index.css

  1. header {
  2.   background-color: #e43130;
  3.   color: #fff;
  4.   height: 4.4rem;
  5.   position: fixed;
  6.   left: 0;
  7.   top: 0;
  8.   right: 0;
  9.   z-index: 100;
  10. }
  12. main {
  13.   position: absolute;
  14.   top: 4.4rem;
  15.   bottom: 4.4rem;
  16. }
  18. footer {
  19.   background-color: #fafafa;
  20.   color: #666;
  21.   height: 4.4rem;
  22.   position: fixed;
  23.   left: 0;
  24.   bottom: 0;
  25.   right: 0;
  26.   z-index: 100;
  27. }

header.css

  1. header {
  2.   display: flex;
  3.   flex-flow: row nowrap;
  4.   align-items: center;
  5. }
  6. header .caidan {
  7.   flex: 1;
  8.   text-align: center;
  9.   font-size: 2.5rem;
  10. }
  11. header .search {
  12.   flex: 5;
  13.   background-color: #ffffff;
  14.   border-radius: 3rem;
  15.   display: flex;
  16.   padding: 0.35rem 0.5rem;
  17. }
  18. header .search .logo {
  19.   font-size: 1.8rem;
  20.   color: #e43130;
  21.   flex: 0 1 4rem;
  22.   text-align: center;
  23. }
  24. header .search .fangda {
  25.   color: #ccc;
  26.   flex: 0 1 4rem;
  27.   border-left: 1px solid;
  28.   align-self: center;
  29.   text-align: center;
  30. }
  31. header .search .words {
  32.   flex: auto;
  33.   border: none;
  34.   outline: none;
  35.   color: #aaa;
  36. }
  37. header .denglu {
  38.   flex: 1;
  39.   color: #fff;
  40.   text-align: center;
  41.   font-size: 1.4rem;
  42. }

footer.css

  1. footer {
  2.   display: flex;
  3.   justify-content: space-around;
  4.   text-align: center;
  5.   align-items: center;
  6. }
  7. footer div .iconfont {
  8.   font-size: 1.4rem;
  9. }
  10. footer div span {
  11.   font-size: 0.8rem;
  12. }
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：配个图会更好一些
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