121 lines
3.2 KiB
Markdown
121 lines
3.2 KiB
Markdown
---
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id: bad87fee1348bd9aeda08826
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title: 使用 jQuery 配合 id 选择器选择元素
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challengeType: 6
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forumTopicId: 18317
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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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dashedName: target-elements-by-id-using-jquery
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---
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# --description--
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你也能通过 id 属性选取标签。
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首先，用`$("#target3")`选择器选取 id 为`target3`的`button`标签。
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注意，和 CSS 属性一样，在 id 名前需要添加`#`。
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然后，用 jQuery 的`.addClass()`方法添加`animated`和`fadeOut`类。
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下面的代码的效果是使 id 为`target6`的`button`标签淡出：
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`$("#target6").addClass("animated fadeOut")`.
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# --hints--
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用 jQuery 的`addClass()`方法给`id`为`target3`的`button`标签添加`animated`类。
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```js
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assert($('#target3').hasClass('animated'));
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```
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用 jQuery 的`addClass()`方法给`id`为`target3`的标签的类添加`fadeOut`类。
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```js
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assert(
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($('#target3').hasClass('fadeOut') || $('#target3').hasClass('fadeout')) &&
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code.match(/\$\(\s*.#target3.\s*\)/g)
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);
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```
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仅用 jQuery 给标签设置类。
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```js
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assert(!code.match(/class.*animated/g));
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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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$(document).ready(function() {
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$("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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<!-- 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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$("button").addClass("animated bounce");
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$(".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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