94 lines
3.4 KiB
Markdown
94 lines
3.4 KiB
Markdown
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---
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id: bad87fee1348bd9aed008826
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title: Target Even Elements Using jQuery
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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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challengeType: 6
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videoUrl: ''
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localeTitle: 使用jQuery定位偶数元素
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---
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## Description
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<section id="description">您还可以使用<code>:odd</code>或<code>:even</code>选择器根据位置定位元素。请注意，jQuery是零索引的，这意味着选择中的第一个元素的位置为0.这可能有点令人困惑，因为反直觉地<code>:odd</code>选择第二个元素（位置1），第四个元素（位置3） ， 等等。以下是如何使用类<code>target</code>定位所有奇数元素并给它们类： <code>$(".target:odd").addClass("animated shake");</code>尝试选择所有偶数<code>target</code>元素，并为它们提供<code>animated</code>和<code>shake</code>类。请记住， <strong>甚至</strong>指的是基于零系统的元素的位置。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: jQuery认为的所有<code>target</code>元素都应该动摇。
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testString: 'assert($(".target:even").hasClass("animated") && $(".target:even").hasClass("shake"), "All of the <code>target</code> elements that jQuery considers to be even should shake.");'
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- text: '您应该使用<code>:even</code>选择器来修改这些元素。'
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testString: 'assert(code.match(/\:even/g), "You should use the <code>:even</code> selector to modify these elements.");'
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- text: 只使用jQuery将这些类添加到元素中。
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testString: 'assert(code.match(/\$\(".target:even"\)/g) || code.match(/\$\(".target:even"\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g), "Only use jQuery to add these classes to the element.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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$("#right-well").children().css("color", "orange");
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$("#left-well").children().css("color", "green");
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$(".target:nth-child(2)").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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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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