grid布局中的对齐方式

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对齐方式分为两大类，一是项目在网格单元内的对齐方式，而是项目在容器内的对齐方式

项目在网格单元内的对齐方式

在声明了grid布局容器内使用place-items:垂直水平;属性
注意：垂直方向：start 代表上 center 中 end 下
水平方向：start 代表左 center中 end 右
如果垂直方向和水平方向值一样可以只写一个

单独设置某个项目的对齐方式

使用place-self:垂直水平；属性

<style>
        .container{
         border: 1px solid #000;
         padding: .5em;
         display: grid;
        grid-template-columns: repeat(3,1fr);
        grid-template-rows: repeat(2,5em);
        grid-auto-rows: 5em;
        gap: 0.5em;
    }
    .container>.item{
        background-color: lightcyan;
        border: 1px solid #000;
        padding: 0.5em;
    }
    .container>.item{
        width: 5em;
        height: 2em;
    }
    /* 项目在网格单元的对齐方式 */
    .container{
        /* place-items:垂直方向，水平方向 */
        /* 垂直向上，水平居中 */
        place-items: start center;
        /* 垂直水平+都居中  当第一个值和第二个值一样可以省略*/
        place-items: center;
        /* 继承 */
        place-items: inherit;
        /* 初始化 */
        place-items: initial;
        /* 取消项目的固定尺寸，拉伸 */
        place-items: stretch;
    }
    /* 单独设置项目的对齐方式 */
    .container>.item:nth-of-type(5){
        background-color: yellow;
        /* 垂直居中 */
        place-self: center center;
        place-self: end start;
    }
</style>
<body>
        <div class="container">
        <span class="item">item1</span>
        <span class="item">item2</span>
        <span class="item">item3</span>
        <span class="item">item4</span>
        <span class="item">item5</span>
        <span class="item">item6</span>
        <span class="item">item7</span>
        <span class="item">item8</span>
        <span class="item">item9</span>
    </div>
</body>

项目在容器内的对齐方式

使用属性：place-content

将所有项目作为一个整体在容器中的对齐方式
将所有项目打散成一个个独立个体在容器中设置对齐方式
注意：容器必须留有剩余空间，否则无法分配

<style>
     .container{
         height: 25em;
         border: 1px solid #000;
         padding: 0.5em;
         display: grid;
         /* 宽度得是固定值，得有剩余空间才能分配 */
        grid-template-columns: repeat(3,10em);
        grid-template-rows: repeat(2,5em);
        grid-auto-rows: 5em;
        gap: 0.5em;
     }
       /* 项目在网格容器的对齐方式 */
    .container{
        /* 1.将所有项目作为一个整体在容器中对齐 */
        place-content: start start;
        place-content: start center;
        place-content: center;
        /* 2.将所有项目打散成一个个独立个体在容器中设置对齐方式 */
        /* 水平垂直 两端对齐 */
         place-content: space-between space-between;
         /* 垂直分散对齐  水平平均对齐*/
         place-content: space-around space-evenly;
    }
</style>

php中文网的布局

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>php中文网首页</title>
    <style>
        *{
          margin: 0;
          padding: 0;  
          box-sizing: border-box;        
        }
       li{
           list-style: none;
       }
       a{
           color:#444;
           text-decoration: none;
       }
       header{
           height: 60px;
           background-color:gray;
           margin-bottom: 30px;
       }
       header>ul.hnav{
           display: grid;
           grid-template-columns: repeat(8,1fr);
           grid-template-rows: 60px;
           place-items: center;
       }
       footer{
            height: 160px;
            color:#EEE;
            background-color: #444;
        }
       .main-top{
          width: 1200px;
          height: 510px;
          display: grid;
          grid-template-columns: 216px 1fr;
          grid-template-rows: 60px 1fr 120px;
          margin: auto;
       }
       .main-top>nav.menus{
           background-color: lightgreen;
           grid-area: span 3;
           border-radius: 10px 0 0 10px;
       }
      .main-top>ul.nav{
        background-color: lightcyan;
          display: grid;
          grid-template-columns: repeat(8,83px) 1fr;
          place-items: center;
      }
      .main-top>ul.nav>li:last-of-type{
            place-self: center start;
            padding-left: 30px;
        }
     .main-top>ul.course{
        background-color: wheat;
         display: grid;
         padding:10px;
         grid-template-columns: repeat(4,1fr);
         gap: 10px;
     }
     .main-top>ul.course>*{
        background-color: violet;
        cursor: pointer;
     }
     /* 横图 */
      .row-image{
          height: 80px;
          margin-top: 20px;
          background-color: lightslategray;
          margin: auto;
      }
      .row-image h1{
        text-align: center;
        line-height:80px;
        color: white;
      }
/* ------------------------------------------------------------------------------------------ */
      .recommend{
          width: 1200px;
          height: 446px;
          background-color: yellowgreen;
          margin-top: 20px;
          display: grid;
          grid-template-columns: 300px 1fr 260px;
          padding: 15px;
          gap: 10px;
          margin: auto;
      }
      .recommend .article{
          background-color: lightcyan;
          display: grid;
          grid-template-rows:36px 1fr;
          padding: 15px;
      }
      .recommend .article h4{
          margin-left: 10px;
      }
      .recommend .article>ul.artul{
        display: grid;
        grid-template-rows: repeat(12,1fr);    
      }
      /* ----------------------------------- */
      .recommend .course{
          background-color: lightcyan;
          display: grid;
          grid-template-rows:36px 1fr;
          padding: 15px;
      }
      .recommend .course h4{
          margin-left: 10px;
      }    
      .recommend .course>ul.cou-list{
          display: grid;
          grid-template-columns: repeat(3,1fr);
          grid-template-rows: repeat(2,1fr);
          gap: 20px;
      }
      .recommend .course>ul.cou-list>*{
            background-color: lightgreen;
            border-radius: 10px;
      }  
/* ------------------------------------ */
      .recommend .manual{
          background-color: lightcyan;
          display: grid;
          grid-template-rows:36px 1fr;
          padding: 15px;
      }
      .recommend .manual>div:first-of-type{
          margin-left: 10px;
          display: flex;
          justify-content: space-between;
      }
      .recommend .manual>ul.man-list{
          display: grid;
          grid-template-rows: repeat(6,1fr);
      }  
      .recommend .manual>ul.man-list>li{
          display: grid;
          grid-template-columns: 50px 1fr;
          gap: 10px;
          margin-bottom: 10px;
      }
      .recommend .manual>ul.man-list>li>img{
          background-color: lightsalmon;
      }
      .recommend .manual>ul.man-list>li>a{
          place-self: center start;
      }
/* ---------------------------------------------------------------------- */
     .main-courses{
           width: 1200px;
           height: 646px;
           padding: 15px;
           background-color: lightskyblue;
           margin: 30px auto;
           display: grid;
           grid-template-rows: 50px 1fr;
           gap:20px;
        }
        .main-courses h3{
            color:#444;
            text-align: center;
            margin-bottom: 30px;
        }
        .main-courses .course-list{
          display: grid;
          grid-template-columns: repeat(5,1fr);
          grid-template-rows: repeat(3,1fr);
          gap: 20px;
        }
        .main-courses .course-list>*{
            background-color: lightcyan;
            border-radius: 10px;
        }
        .main-courses .course-list>li:first-of-type{
            grid-area: span 2;
        }
    </style>
</head>
<body>
    <header>
        <ul class="hnav">
            <li><a href="">item1</a></li>
            <li><a href="">item2</a></li>
            <li><a href="">item3</a></li>
            <li><a href="">item4</a></li>
            <li><a href="">item5</a></li>
            <li><a href="">item6</a></li>
            <li><a href="">item7</a></li>
            <li><a href="">item8</a></li>
        </ul>
    </header>
    <div class="main-top">
       <nav class="menus">菜单组</nav>
       <!-- 顶部菜单 -->
       <ul class="nav">
           <li><a href="">item1</a></li>
           <li><a href="">item2</a></li>
           <li><a href="">item3</a></li>
           <li><a href="">item4</a></li>
           <li><a href="">item5</a></li>
           <li><a href="">item6</a></li>
           <li><a href="">item7</a></li>
           <li><a href="">item8</a></li>
           <li><input type="text" placeholder="输入关键字"></li>
       </ul>
       <div class="slider">轮播图</div>
        <!-- 底部课程推荐 -->
        <ul class="course">
            <li><a href=""><img src="" alt=""></a></li>
            <li><a href=""><img src="" alt=""></a></li>
            <li><a href=""><img src="" alt=""></a></li>
            <li><a href=""><img src="" alt=""></a></li>
        </ul>
    </div>
   <div class="row-image">
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       <div class="course">
           <h4>最新课程</h4>
           <ul class="cou-list">
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               <li><a href=""><img src="" alt=""></a></li>
               <li><a href=""><img src="" alt=""></a></li>
               <li><a href=""><img src="" alt=""></a></li>
           </ul>
       </div>
       <div class="manual">
           <div><h4>常用手册</h4><span>更多</span></div>
           <ul class="man-list">
               <li><img src="" alt=""><a href="">item1</a></li>
               <li><img src="" alt=""><a href="">item2</a></li>
               <li><img src="" alt=""><a href="">item3</a></li>
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               <li><img src="" alt=""><a href="">item5</a></li>
               <li><img src="" alt=""><a href="">item6</a></li>
           </ul>
        </div>
   </div>
    <!-- 课程列表区 -->
    <div class="main-courses">
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理解grid的媒体查询与专业的媒体查询有什么区别

grid的媒体查询兼容性有问题
media媒体查询兼容性强，但需要写多个媒体查询

Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：只是简单的将课堂代码抄了一遍提交,应该换个页面组件来写,这样的作业适合自己练习就不要再发出来了

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