2018-10-10 22:03:03 +00:00
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---
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id: bad87fee1348bd9aed908626
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2021-03-05 15:43:24 +00:00
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title: 用多个 jQuery 选择器选择同一个元素
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2018-10-10 22:03:03 +00:00
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challengeType: 6
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2020-09-07 08:17:51 +00:00
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forumTopicId: 18322
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2020-12-16 07:37:30 +00:00
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required:
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2021-02-06 04:42:36 +00:00
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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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2021-01-13 02:31:00 +00:00
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dashedName: target-the-same-element-with-multiple-jquery-selectors
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-03-05 15:43:24 +00:00
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现在学写了三种选取标签的方法:用标签选择器: `$("button")`,用类选择器:`$(".btn")` 以及用 id 选择器:`$("#target1")` 。
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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虽然可以在单个 `.addClass()` 内添加多个类,但是我们可以用*三种不同的方式*给一种标签添加类。
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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以三种不同的方式用 `.addClass()` 方法每次只给一种标签添加一个类:
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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给所有的 `button` 标签添加 `animated` 类。
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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给所有类为 `.btn` 的 button 标签添加 `shake` 类。
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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给所有 id 为 `#target1` 的 button 标签添加 `btn-primary` 类。
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2020-12-16 07:37:30 +00:00
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2021-03-05 15:43:24 +00:00
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**注意:**只针对一个元素并且一次只能添加一个 class。 总之,三个选择器最终将添加三个 class `shake`、`animated` 以及 `btn-primary` 到 `#target1` 上。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2021-03-05 15:43:24 +00:00
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应该使用 `$("button")` 选择器。
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2020-12-16 07:37:30 +00:00
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```js
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assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?button\s*?(?:'|")/gi));
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2018-10-10 22:03:03 +00:00
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```
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2021-03-05 15:43:24 +00:00
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应该使用 `$(".btn")` 选择器。
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2020-12-16 07:37:30 +00:00
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```js
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assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?\.btn\s*?(?:'|")/gi));
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2018-10-10 22:03:03 +00:00
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```
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2021-03-05 15:43:24 +00:00
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应该使用 `$("#target1")` 选择器。
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2020-12-16 07:37:30 +00:00
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```js
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assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")/gi));
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```
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2021-03-05 15:43:24 +00:00
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三个选择器每个应该只添加一个类。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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code.match(/addClass/g) &&
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code.match(/addClass\s*?\(\s*?('|")\s*?[\w-]+\s*?\1\s*?\)/g).length > 2
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);
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```
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2021-03-05 15:43:24 +00:00
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`#target1` 标签应具有 `animated`、`shake` 和 `btn-primary` 三个类。
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$('#target1').hasClass('animated') &&
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$('#target1').hasClass('shake') &&
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$('#target1').hasClass('btn-primary')
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);
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```
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2021-03-05 15:43:24 +00:00
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应该仅用 jQuery 给标签添加类。
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2020-12-16 07:37:30 +00:00
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```js
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assert(!code.match(/class.*animated/g));
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2018-10-10 22:03:03 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --seed-contents--
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```html
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<script>
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$(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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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-09-07 08:17:51 +00:00
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2021-01-13 02:31:00 +00:00
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```html
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<script>
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$(document).ready(function() {
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$("button").addClass("animated");
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$(".btn").addClass("shake");
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$("#target1").addClass("btn-primary");
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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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