120 lines
3.7 KiB
Markdown
120 lines
3.7 KiB
Markdown
---
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id: bad87fee1348bd9bedc08826
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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: 18319
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title: 使用 jQuery 配合元素选择器选择元素
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---
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## Description
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<section id='description'>
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接下来我们学习<code>document ready function</code>。
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首先，我们完成第一个 jQuery 语句。所有的 jQuery 函数以<code>$</code>开头，这个符号通常被称为<code>美元符号（dollar sign operator）</code>或<code>bling</code>。
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jQuery 通常选取并操作带有<code>选择器（selector）</code>的 HTML 标签。
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例如，如果要所有<code>button</code>有弹性的动画效果，只需在<code>document ready function</code>中添加如下代码即可：
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<code>$("button").addClass("animated bounce");</code>
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请注意，为了能在编辑器里直接使用，我们已经为你在后台引入了 jQuery 库和 Animate.css 库。因此，你只需要通过 jQuery 给<code>button</code>元素添加<code>bounce</code>类就可以了。
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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 jQuery 的<code>addClass()</code>方法给<code>button</code>标签添加<code>animated</code>和<code>bounce</code>类。
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testString: 'assert($("button").hasClass("animated") && $("button").hasClass("bounce"));'
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- text: 仅用 jQuery 给标签添加颜色。
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testString: 'assert(!code.match(/class.*animated/g));'
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- text: jQuery 代码应该放在<code>$(document).ready();</code>函数里。
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testString: assert(code.match(/\$\(document\)\.ready\(function.*(\s|\n)*.*button.*.addClass.*\);/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 bounce");
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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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