130 lines
4.5 KiB
Markdown
130 lines
4.5 KiB
Markdown
---
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id: bad87fee1348bd9aed908626
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required:
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- link: 'https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css'
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challengeType: 6
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forumTopicId: 18322
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title: 用多个 jQuery 选择器选择同一个元素
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---
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## Description
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<section id='description'>
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现在你知道三种选取标签的方法：用标签选择器，如<code>$("button")</code>；用类选择器，<code>$(".btn")</code>以及用 id 选择器，<code>$("#target1")</code>。
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虽然可以在单个<code>.addClass()</code>内添加多个类，但是我们可以用<em>三种不同的方式</em>给一种标签添加类。
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以三种不同的方式用<code>.addClass()</code>方法每次只给一种标签添加一个类：
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给所有的<code>button</code>标签添加<code>animated</code>类。
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给所有类为<code>.btn</code>的<code>button</code>标签添加<code>shake</code>类。
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给所有 id 为<code>#target1</code>的<code>button</code>标签添加<code>btn-primary</code>类。
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<strong>注意：</strong><br>虽然三个选择器最终给 id 为<code>#target1</code>的<code>button</code>标签添加<code>shake</code>、<code>animated</code>和<code>btn-primary</code>等三个类，但是你需要用且仅用三种不同的选择器给三种标签各添加一个类（译者注：所谓的“一种标签”是指他们有某种共同的特点，如包含同一个 class）。
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: "用<code>$('button')</code>选择标签。"
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testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?button\s*?(?:'|")/gi));
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- text: "用<code>$('.btn')</code>选择标签。"
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testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?\.btn\s*?(?:'|")/gi));
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- text: "用<code>$('#target1')</code>选择标签。"
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testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")/gi));
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- text: 三个选择器每个只添加一个类。
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testString: assert(code.match(/addClass/g) && code.match(/addClass\s*?\(\s*?('|")\s*?[\w-]+\s*?\1\s*?\)/g).length > 2);
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- text: <code>#target1</code>标签应具有<code>animated</code>、<code>shake</code>和<code>btn-primary</code>三个类。
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testString: assert($('#target1').hasClass('animated') && $('#target1').hasClass('shake') && $('#target1').hasClass('btn-primary'));
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- text: 仅用 jQuery 给标签添加类。
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testString: assert(!code.match(/class.*animated/g));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<script>
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$(document).ready(function() {
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});
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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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$(document).ready(function() {
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$("button").addClass("animated");
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$(".btn").addClass("shake");
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$("#target1").addClass("btn-primary");
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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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