freeCodeCamp/curriculum/challenges/chinese/03-front-end-libraries/jquery/target-the-children-of-an-element-using-jquery.md

---
id: bad87fee1348bd9aed208826
challengeType: 6
forumTopicId: 18320
title: 使用 jQuery 选择元素的子元素
---

## Description
<section id='description'>
把 HTML 标签放到另一个级别的标签里，这些 HTML 标签被称为该标签的<code>子标签（children element）</code>。例如，本次挑战中文本为 "#target1"、"#target2" 和 "#target3" 的按钮都是<code>&#60;div class="well" id="left-well"&#62;</code>标签的<code>子标签</code>。
jQuery 有一个<code>children()</code>方法，可以访问被选取标签的子标签。
下面的代码展示了用<code>children()</code>方法把<code>left-well</code>标签的子标签的颜色设置成<code>蓝色（blue）</code>：
<code>$("#left-well").children().css("color", "blue")</code>
</section>

## Instructions
<section id='instructions'>
请把<code>right-well</code>标签的所有子标签颜色设置成<code>橙色（orange）</code>。
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>#right-well</code>所有的子标签文本应该是橙色。
    testString: assert($("#right-well").children().css("color") === 'rgb(255, 165, 0)');
  - text: 应该用<code>children&#40&#41</code>方法修改标签。
    testString: assert(code.match(/\.children\(\)\.css/g));
  - text: 仅用 jQuery 给标签添加类。
    testString: assert(code.match(/<div class="well" id="right-well">/g));

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='html-seed'>

```html
<script>
  $(document).ready(function() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");

  });
</script>

<!-- 请修改本行以上的代码 -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="btn btn-default target" id="target1">#target1</button>
        <button class="btn btn-default target" id="target2">#target2</button>
        <button class="btn btn-default target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>
      </div>
    </div>
  </div>
</div>
```

</div>



</section>

## Solution
<section id='solution'>

```html
<script>
  $(document).ready(function() {
    $("#target1").css("color", "red");
    $("#target1").prop("disabled", true);
    $("#target4").remove();
    $("#target2").appendTo("#right-well");
    $("#target5").clone().appendTo("#left-well");
    $("#target1").parent().css("background-color", "red");
    $("#right-well").children().css("color", "orange");
  });
</script>

<!-- Only change code above this line. -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <h4>#left-well</h4>
      <div class="well" id="left-well">
        <button class="btn btn-default target" id="target1">#target1</button>
        <button class="btn btn-default target" id="target2">#target2</button>
        <button class="btn btn-default target" id="target3">#target3</button>
      </div>
    </div>
    <div class="col-xs-6">
      <h4>#right-well</h4>
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>
      </div>
    </div>
  </div>
</div>
```

</section>