119 lines
3.3 KiB
Markdown
119 lines
3.3 KiB
Markdown
---
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id: bad87fee1348bd9bedc08826
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title: 使用 jQuery 選擇器選擇元素
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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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現在我們有一個 `document ready` 函數。
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首先，完成第一個 jQuery 語句。 所有的 jQuery 函數都以 `$` 開頭，這個符號通常被稱爲美元符號（dollar sign operator）或 bling。
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jQuery 通常選取並操作帶有<dfn>選擇器（selector）</dfn>的 HTML 標籤。
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比如，想要給 `button` 元素添加跳躍效果。 只需要在 document ready 函數內添加如下代碼：
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```js
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$("button").addClass("animated bounce");
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```
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請注意，我們已經在後臺引入了 jQuery 庫和 Animate.css 庫，所以你可以在編輯器裏直接使用它們。 你將使用 jQuery 將 Animate.css `bounce` class 應用於 `button` 元素。
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# --hints--
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應該用 jQuery 的 `addClass()` 函數給 `button` 元素添加 `animated` 和 `bounce` class。
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```js
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assert($('button').hasClass('animated') && $('button').hasClass('bounce'));
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```
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應該僅用 jQuery 給標籤添加 class。
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```js
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assert(!code.match(/class.*animated/g));
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```
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jQuery 代碼應該放在 `$(document).ready();` 函數裏。
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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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