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										 |  |  |  | --- | 
					
						
							|  |  |  |  | id: bad87fee1348bd9bedc08826 | 
					
						
							|  |  |  |  | title: Target HTML Elements with Selectors Using jQuery | 
					
						
							|  |  |  |  | required: | 
					
						
							|  |  |  |  |   - link: 'https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css' | 
					
						
							|  |  |  |  | challengeType: 6 | 
					
						
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										 |  |  |  | forumTopicId: 18319 | 
					
						
							|  |  |  |  | localeTitle: 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'> | 
					
						
							|  |  |  |  | 接下来我们学习<code>document ready function</code>。 | 
					
						
							|  |  |  |  | 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>。 | 
					
						
							|  |  |  |  | jQuery 通常选取并操作带有<code>选择器(selector)</code>的 HTML 标签。 | 
					
						
							|  |  |  |  | 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: | 
					
						
							|  |  |  |  | <code>$("button").addClass("animated bounce");</code> | 
					
						
							|  |  |  |  | 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。 | 
					
						
							|  |  |  |  | </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 | 
					
						
							|  |  |  |  | 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 | 
					
						
							|  |  |  |  | <script> | 
					
						
							|  |  |  |  |   $(document).ready(function() { | 
					
						
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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"> | 
					
						
							|  |  |  |  |   <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> | 
					
						
							|  |  |  |  | ``` | 
					
						
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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 | 
					
						
							|  |  |  |  | <script> | 
					
						
							|  |  |  |  |   $(document).ready(function() { | 
					
						
							|  |  |  |  |     $("button").addClass("animated bounce"); | 
					
						
							|  |  |  |  |   }); | 
					
						
							|  |  |  |  | </script> | 
					
						
							|  |  |  |  | 
 | 
					
						
							|  |  |  |  | <!-- Only change code above this line. --> | 
					
						
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 | 
					
						
							|  |  |  |  | <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> | 
					
						
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										 |  |  |  | ``` | 
					
						
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										 |  |  |  | </section> |