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提问者：小点点

用jQuery插件给HTML行添加类？


我有一个HTML格式的表，需要特别使用jQuery对其进行修改。我需要应用'header'类到主要行和‘偶数’和‘奇数’类到其他行的连续顺序。

因此，该表将在每一个连续行中有一个蓝色的主标题和浅灰色的背景行。我怎样才能做到这一点呢？我已经有了CSS，只需要弄清楚如何抓取这些行并添加类。您可以在附加的.js文件中看到我的尝试。我做错了什么？

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"use strict";

// this JS file will call the plugin when the page loads

$(document).ready(function() {
   
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

null

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"use strict";
// this is where jQuery goes

$(function(){
 $('#important tr:first-child').addClass('header');

  $("#important tr:not(header)").each(function(index) {
    $(this).addClass((index % 2) ? "even" : "odd");
  });

});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">  
    <title>Alternating Row Plugin</title>
    <link rel="stylesheet" href="altrow.css">
    <script src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
    <script src="jquery.altrow.js"></script>
    <script src="altrow.js"></script>
</head>
<body>
    <main>
      <h1>Important People in Computer Science</h1>
      <table id="important">
            <tr>
                <th>First Name</th><th>Last Name</th><th>Date of Birth</th><th>Accomplishment</th>
            </tr>
            <tr>
                <td>Charles</td><td>Babbage</td><td>12/26/1791</td>
                <td>Originated the concept of a programmable computer, invented the first mechanical computer.</td>
            </tr>
            <tr>
                <td>Ada</td><td>Lovelace</td><td>12/10/1815</td>
                <td>First computer programmer. Wrote an algorithm for Babbage's mechanical computer.</td>
            </tr>
            <tr>
                <td>Alan</td><td>Turing</td><td>6/23/1912</td>
                <td>Invented the Turing Machine, a hypothetical device that's a model of a general purpose computer.</td>
            </tr>
            <tr>
                <td>Grace</td><td>Hopper</td><td>12/9/1906</td>
                <td>Invented the first compiler for a computer programming language, popularized the term "debugging" for fixing computer glitches.</td>
            </tr>
        </table>
    </main>
</body>
</html>

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共2个答案

匿名用户

正如所指出的，您不需要Javascript，您可以用CSS解决这一点。但是，由于您的问题特别要求使用Javascript，所以我将为您提供JS解决方案。首先，让我们修正一下你的错别字：

$('#important tr:first-child').addClass('header');

注意上面的大写c。

就在上面的线下面，做类似这样的事情

$("#important tr:not(header)").each(function(index) {
    $(this).addClass((index % 2) ? "even" : "odd");
});

完整解决方案：

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">  
    <title>Alternating Row Plugin</title>
    <link rel="stylesheet" href="altrow.css">
    <script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
    <script src="jquery.altrow.js"></script>
    <script src="altrow.js"></script>
    <style>
        .even {
            background-color: lightgray;
        }
        .odd {
            background-color: darkgray;
        }
        .header {
            background-color: lightblue;
        }
    </style>
    <script>
        $(function() {
            $('#important tr:first-child').addClass('header');
            $("#important tr:not(.header)").each(function(index) {
                $(this).addClass((index % 2) ? "even" : "odd");
            });
        });
    </script>
</head>
<body>
    <main>
      <h1>Important People in Computer Science</h1>
      <table id="important">
            <tr>
                <th>First Name</th><th>Last Name</th><th>Date of Birth</th><th>Accomplishment</th>
            </tr>
            <tr>
                <td>Charles</td><td>Babbage</td><td>12/26/1791</td>
                <td>Originated the concept of a programmable computer, invented the first mechanical computer.</td>
            </tr>
            <tr>
                <td>Ada</td><td>Lovelace</td><td>12/10/1815</td>
                <td>First computer programmer. Wrote an algorithm for Babbage's mechanical computer.</td>
            </tr>
            <tr>
                <td>Alan</td><td>Turing</td><td>6/23/1912</td>
                <td>Invented the Turing Machine, a hypothetical device that's a model of a general purpose computer.</td>
            </tr>
            <tr>
                <td>Grace</td><td>Hopper</td><td>12/9/1906</td>
                <td>Invented the first compiler for a computer programming language, popularized the term "debugging" for fixing computer glitches.</td>
            </tr>
        </table>
    </main>
</body>
</html>

匿名用户

对于这个简单的任务，您不需要Javascript，您可以通过CSS将even或odd元素作为目标：

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tbody tr:nth-child(even)  {
  background-color: pink;
}

tbody tr:nth-child(odd)  {
  background-color: green;
  color: white;
}
<main>
  <h1>Important People in Computer Science</h1>
  <table id="important">
    <thead>
      <tr>
        <th>First Name</th>
        <th>Last Name</th>
        <th>Date of Birth</th>
        <th>Accomplishment</th>
      </tr>
      <thead>
        <tbody>
          <tr>
            <td>Charles</td>
            <td>Babbage</td>
            <td>12/26/1791</td>
            <td>Originated the concept of a programmable computer, invented the first mechanical computer.</td>
          </tr>
          <tr>
            <td>Ada</td>
            <td>Lovelace</td>
            <td>12/10/1815</td>
            <td>First computer programmer. Wrote an algorithm for Babbage's mechanical computer.</td>
          </tr>
          <tr>
            <td>Alan</td>
            <td>Turing</td>
            <td>6/23/1912</td>
            <td>Invented the Turing Machine, a hypothetical device that's a model of a general purpose computer.</td>
          </tr>
          <tr>
            <td>Grace</td>
            <td>Hopper</td>
            <td>12/9/1906</td>
            <td>Invented the first compiler for a computer programming language, popularized the term "debugging" for fixing computer glitches.</td>
          </tr>
          <tbody>
  </table>
</main>

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