130 lines
4.0 KiB
Markdown
130 lines
4.0 KiB
Markdown
---
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id: bad87fee1348bd9aed208826
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title: Target the Children of an Element Using jQuery
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challengeType: 6
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forumTopicId: 18320
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localeTitle: 使用 jQuery 选择元素的子元素
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---
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## Description
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<section id='description'>
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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><div class="well" id="left-well"></code>标签的<code>子标签</code>。
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jQuery 有一个<code>children()</code>方法，可以访问被选取标签的子标签。
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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>：
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<code>$("#left-well").children().css("color", "blue")</code>
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</section>
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## Instructions
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<section id='instructions'>
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请把<code>right-well</code>标签的所有子标签颜色设置成<code>橙色（orange）</code>。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>#right-well</code>所有的子标签文本应该是橙色。
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testString: assert($("#right-well").children().css("color") === 'rgb(255, 165, 0)');
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- text: 应该用<code>children()</code>方法修改标签。
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testString: assert(code.match(/\.children\(\)\.css/g));
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- text: 仅用 jQuery 给标签添加类。
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testString: assert(code.match(/<div class="well" id="right-well">/g));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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});
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</script>
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<!-- 请修改本行以上的代码 -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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$("#right-well").children().css("color", "orange");
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});
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</script>
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<!-- Only change code above this line. -->
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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```
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</section>
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