123 lines
3.2 KiB
Markdown
123 lines
3.2 KiB
Markdown
---
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id: bad87fee1348bd9aed918626
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title: 使用 jQuery 从元素中移除 class
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challengeType: 6
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forumTopicId: 18264
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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: remove-classes-from-an-element-with-jquery
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---
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# --description--
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和用 jQuery 的 `addClass()` 方法给标签添加类一样，也可以利用 jQuery 的 `removeClass()` 方法移除它们。
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下面是为指定按钮执行上面的操作的代码：
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```js
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$("#target2").removeClass("btn-default");
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```
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请把所有 `button` 元素的 `btn-default` class 移除。
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# --hints--
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应该移除所有 `button` 元素 `btn-default` class。
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```js
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assert($('.btn-default').length === 0);
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```
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应该仅用 jQuery 从元素中移除 class。
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```js
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assert(code.match(/btn btn-default/g));
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```
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应该仅移除 `btn-default` class。
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```js
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assert(
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code.match(
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/\.[\v\s]*removeClass[\s\v]*\([\s\v]*('|")\s*btn-default\s*('|")[\s\v]*\)/gm
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)
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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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$(document).ready(function() {
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$("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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# --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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$("button").removeClass("btn-default");
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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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