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jquery $()的参数和选择器
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jquery $()的参数和选择器

作业标题：0719作业
作业内容：1、下载并引用jQuery 2、JavaScript 和 jQuery 对比。 3、列出 $() 的参数 4、列出选择器，并查看效果。

  1. 下载并引用jQuery
    jq引用
  2. JavaScript 和 jQuery 对比。
    1. //js
    2. document
    3.      .querySelectorAll(".item")
    4.      .forEach((item) => (item.style.color = "green"));
    5. //jquery
    6.    $(".item").css("color", "red");

  3. 列出 $() 的参数
    选择器 包装器 html文本 回调

  4. 列出选择器，并查看效果

    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>$() 选择器</title>
    8.  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
    9.  <style>
    10.    * {
    11.      font-size: 20px;
    12.    }
    13.    .title {
    14.      text-align: center;
    15.    }
    16.    .width {
    17.      width: 1200px;
    18.    }
    19.    tr {
    20.      height: 50px;
    21.    }
    22.  </style>
    23. </head>
    24. <body>
    25.  <h3 class="title h3" id="titleId">用户列表</h3>
    26.  <table class="width" id="tableId" border="1" align="center" cellspacing="0">
    27.    <thead>
    28.      <tr>
    29.        <th>编号</th>
    30.        <th>姓名</th>
    31.        <th>邮箱</th>
    32.        <th>电话</th>
    33.        <th>省份</th>
    34.        <th>城市</th>
    35.        <th>年龄</th>
    36.      </tr>
    37.    </thead>
    38.    <tbody>
    39.      <tr>
    40.        <th>1</th>
    41.        <td>天蓬</td>
    42.        <td>tianpeng@php.cn</td>
    43.        <td>13854381111</td>
    44.        <td>安徽</td>
    45.        <td>合肥</td>
    46.        <td>40</td>
    47.      </tr>
    48.      <tr>
    49.        <th>2</th>
    50.        <td>欧阳克</td>
    51.        <td>ouyangke@php.cn</td>
    52.        <td>13854382222</td>
    53.        <td>安徽</td>
    54.        <td>马鞍山</td>
    55.        <td>40</td>
    56.      </tr>
    57.      <tr>
    58.        <th>3</th>
    59.        <td>灭绝师太</td>
    60.        <td>miejue@php.cn</td>
    61.        <td>13854383333</td>
    62.        <td>安徽</td>
    63.        <td>滁州</td>
    64.        <td>18</td>
    65.      </tr>
    66.      <tr>
    67.        <th>4</th>
    68.        <td>裘千丈</td>
    69.        <td>qiuqianzhang@php.cn</td>
    70.        <td>13854384444</td>
    71.        <td>安徽</td>
    72.        <td>蚌埠</td>
    73.        <td>40</td>
    74.      </tr>
    75.      <tr>
    76.        <th>5</th>
    77.        <td>钟老师</td>
    78.        <td>zhonglaoshi@php.cn</td>
    79.        <td>13854385555</td>
    80.        <td>安徽</td>
    81.        <td>淮南</td>
    82.        <td>30</td>
    83.      </tr>
    84.      <tr>
    85.        <th>6</th>
    86.        <td>小编1</td>
    87.        <td>xiaobian1@php.cn</td>
    88.        <td>13854386661</td>
    89.        <td>安徽</td>
    90.        <td>安庆</td>
    91.        <td>18</td>
    92.      </tr>
    93.      <tr>
    94.        <th>7</th>
    95.        <td>小编2</td>
    96.        <td>xiaobian2@php.cn</td>
    97.        <td>13854386662</td>
    98.        <td>安徽</td>
    99.        <td>亳州</td>
    100.        <td>18</td>
    101.      </tr>
    102.      <tr>
    103.        <th>8</th>
    104.        <td>小编3</td>
    105.        <td>xiaobian3@php.cn</td>
    106.        <td>13854386663</td>
    107.        <td>安徽</td>
    108.        <td>淮北</td>
    109.        <td>18</td>
    110.      </tr>
    111.      <tr>
    112.        <th>9</th>
    113.        <td>小编4</td>
    114.        <td>xiaobian4@php.cn</td>
    115.        <td>13854386664</td>
    116.        <td>安徽</td>
    117.        <td>阜阳</td>
    118.        <td>18</td>
    119.      </tr>
    120.      <tr>
    121.        <th>10</th>
    122.        <td>小编5</td>
    123.        <td>xiaobian5@php.cn</td>
    124.        <td>13854386665</td>
    125.        <td>安徽</td>
    126.        <td>六安</td>
    127.        <td>18</td>
    128.      </tr>
    129.    </tbody>
    130.  </table>
    131. </body>
    132. <script>
    133.  //1.标签选择器
    134.  console.log($("table"));
    135.  $("table").css("color", "red");
    136.  console.log(document.getElementsByTagName("h3"));
    137.  // 2.id选择器 #代表id
    138.  //jquery获取的id,是一个对象，里面有0下标
    139.  console.log($("#titleId"));
    140.  $("#titleId").css("background-color", "blue");
    141.  //js获取的id,是html代码
    142.  console.log(document.getElementById("titleId"));
    144.  //3.class选择器
    145.  $(".title").css("color", "green");
    146.  console.log($(".title"));
    147.  $(".title").css("color", "red");
    148.  console.log(document.getElementsByClassName("title"));
    150.  //4.dom树选择
    151.  console.log($("table tbody tr th"));
    152.  $("table tbody tr th").css("color", "#d4edda");
    154.  $("#tableId td").css("background-color", "#f8d7da");
    155.  $(".width thead th").css("background-color", "blue");
    156.  //可以选择多个标签，多个ID、多个class,用,逗号隔开
    157.  $("h3,th").css("background-color","#d1ecf1");
    158.  $("h3,th").css("background-color", "#d1ecf1");
    159.  $("#tableId,#titleId").css("background-color", "#d1ecf1");
    160. </script>
    161. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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