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#css之魔盒及媒体查询
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css之魔盒及媒体查询

  1. 写在前言
    / 重置方法 /
    1.    .box {
    2.      margin: 0;
    3.      padding: 0;
    4.      box-sizing: border-box;
    5.    }
    / 写在前言:像素单位 px em=16px rem=font-size vh/vw=均等分 /
    / 媒体: 屏幕, 打印机 /
    / 查询: 查询当前屏幕宽度变化 /
    / btn增加样式 /

  2. 代码如下：含注释

    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>魔盒及媒体查询</title>
    8.  <style>
    9.    html {
    10.      font-size: 10px;
    11.    }
    12.    /* 重置方法 */
    13.    /* .box {
    14.      margin: 0;
    15.      padding: 0;
    16.      box-sizing: border-box;
    17.    } */
    18.    /* 写在前言:像素单位  px  em=16px  rem=font-size vh/vw=均等分  */
    19.    /* 媒体: 屏幕, 打印机 */
    20.    /* 查询: 查询当前屏幕宽度变化 */
    21.    /* btn增加样式 */
    22.    .btn {
    23.      background-color: gray;
    24.      color: white;
    25.      border: none;
    26.      outline: none;
    27.    }
    28.    /* 增加btn效果 */
    29.    .btn:hover {
    30.      /* 鼠标移动至目标时变形状 cursor */
    31.      cursor: pointer;
    32.      /* 改变透明度opacity */
    33.      opacity: 0.4;
    34.      /* 动画时间transition */
    35.      transition: 0.4s;
    36.    }
    37.    .btn.small {
    38.      /* 改变大小 */
    39.      font-size: 1.2rem;
    40.      /* 改变边距 */
    41.      padding: 2rem 4rem;
    42.    }
    43.    .btn.middle {
    44.      /* 改变大小 */
    45.      font-size: 2rem;
    46.      /* 改变边距 */
    47.      padding: 2rem 4rem;
    48.    }
    49.    .btn.large {
    50.      /* 改变大小 */
    51.      font-size: 2.6rem;
    52.      /* 改变边距 */
    53.      padding: 2rem 4rem;
    54.    }
    55.    /* !动态改变rem大小就可以跳转按钮大小
    56.     pc优先,从最大的屏幕开始查询 */
    58.    @media (max-width: 720px) {
    59.      html {
    60.        font-size: 20px;
    61.      }
    62.    }
    63.    @media (max-width: 480px) {
    64.      html {
    65.        font-size: 18px;
    66.      }
    67.    }
    68.    @media (max-width: 360px) {
    69.      html {
    70.        font-size: 14px;
    71.      }
    72.    }
    73.    @media (min-width: 720px) {
    74.      html {
    75.        font-size: 20px;
    76.      }
    77.    }
    78.  </style>
    79. </head>
    80. <body>
    81.  <div class="box"></div>
    82.  <button class="btn small">按钮1</button>
    83.  <button class="btn middle">按钮2</button>
    84.  <button class="btn large">按钮3</button>
    85. </body>
    86. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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