117 lines
3.3 KiB
Markdown
117 lines
3.3 KiB
Markdown
---
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id: bad87fee1348bd9bedc08826
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title: 使用 jQuery 选择器选择元素
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challengeType: 6
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forumTopicId: 18319
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required:
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-
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link: 'https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.2.0/animate.css'
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dashedName: target-html-elements-with-selectors-using-jquery
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---
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# --description--
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现在已经有了 `document ready function`。
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首先，完成第一个 jQuery 语句。 所有的 jQuery 函数都以 `$` 开头，这个符号通常被称为美元符号（dollar sign operator）或 bling。
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jQuery 通常选取并操作带有<dfn>选择器（selector）</dfn>的 HTML 标签。
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比如，想要给 `button` 元素添加跳跃效果。 只需要在 document ready 函数内添加如下代码：
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`$("button").addClass("animated bounce");`
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请注意，已经在后台引入了 jQuery 库和 Animate.css 库，所以可以在编辑器里直接使用 jQuery 和动画。 因此，只需要通过 jQuery 给 `button` 元素添加 `bounce` 类就可以了。
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# --hints--
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应该用 jQuery 的 `addClass()` 方法给 `button` 标签添加 `animated` 和 `bounce` 类。
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```js
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assert($('button').hasClass('animated') && $('button').hasClass('bounce'));
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```
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应该仅用 jQuery 给标签添加这些 class。
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```js
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assert(!code.match(/class.*animated/g));
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```
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jQuery 代码应该放在 `$(document).ready();` 函数里。
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```js
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assert(
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code.replace(/\s/g, '').match(/\$\(document\)\.ready\(function\(\)\{\$/g)
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);
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```
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# --seed--
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## --seed-contents--
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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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<!-- 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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# --solutions--
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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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