124 lines
3.7 KiB
Markdown
124 lines
3.7 KiB
Markdown
---
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id: bad87fee1348bd9aeda08826
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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: 18317
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title: 使用 jQuery 配合 id 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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你也能通过 id 属性选取标签。
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首先,用<code>$("#target3")</code>选择器选取 id 为<code>target3</code>的<code>button</code>标签。
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注意,和 CSS 属性一样,在 id 名前需要添加<code>#</code>。
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然后,用 jQuery 的<code>.addClass()</code>方法添加<code>animated</code>和<code>fadeOut</code>类。
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下面的代码的效果是使 id 为<code>target6</code>的<code>button</code>标签淡出:
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<code>$("#target6").addClass("animated fadeOut")</code>.
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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>id</code>为<code>target3</code>的<code>button</code>标签添加<code>animated</code>类。
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testString: assert($("#target3").hasClass("animated"));
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- text: 用 jQuery 的<code>addClass()</code>方法给<code>id</code>为<code>target3</code>的标签的类添加<code>fadeOut</code>类。
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testString: assert(($("#target3").hasClass("fadeOut") || $("#target3").hasClass("fadeout")) && code.match(/\$\(\s*.#target3.\s*\)/g));
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- text: 仅用 jQuery 给标签设置类。
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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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$(document).ready(function() {
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$("button").addClass("animated bounce");
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$(".well").addClass("animated shake");
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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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$("button").addClass("animated bounce");
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$(".well").addClass("animated shake");
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$("#target3").addClass("animated fadeOut");
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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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