88 lines
3.6 KiB
Markdown
88 lines
3.6 KiB
Markdown
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---
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id: 564944c91be2204b269d51e3
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title: Change Text Inside an Element Using jQuery
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challengeType: 6
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videoUrl: ''
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localeTitle: 使用jQuery更改元素内的文本
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---
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## Description
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<section id="description">使用jQuery，您可以更改元素的开始和结束标记之间的文本。您甚至可以更改HTML标记。 jQuery有一个名为<code>.html()</code>的函数，它允许您在元素中添加HTML标记和文本。之前在元素中的任何内容都将完全替换为您使用此功能提供的内容。以下是重写和强调标题文本的方法： <code>$("h3").html("<em>jQuery Playground</em>");</code> jQuery也有一个类似的函数<code>.text()</code> ，它只改变文本而不添加标签。换句话说，此函数不会评估传递给它的任何HTML标记，而是将其视为要替换现有内容的文本。通过强调其文本来更改id为<code>target4</code>的按钮。查看此<a href="https://developer.mozilla.org/en/docs/Web/HTML/Element/em" target="_blank">链接</a>以了解有关<code><i></code>和<code><em></code>之间的区别及其用途的更多信息。请注意，虽然<code><i></code>标签传统上一直用于强调文本，但它已被合并用作图标标签。 <code><em></code>标签现在被广泛接受为强调标签。两者都可以应对这一挑战。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 通过添加HTML标记强调<code>target4</code>按钮中的文本。
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testString: 'assert.isTrue((/<em>|<i>\s*#target4\s*<\/em>|<\/i>/gi).test($("#target4").html()), "Emphasize the text in your <code>target4</code> button by adding HTML tags.");'
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- text: 确保文本不变。
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testString: 'assert($("#target4") && $("#target4").text().trim() === "#target4", "Make sure the text is otherwise unchanged.");'
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- text: 不要改变任何其他文字。
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testString: 'assert.isFalse((/<em>|<i>/gi).test($("h3").html()), "Do not alter any other text.");'
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- text: 确保使用<code>.html()</code>而不是<code>.text()</code> 。
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testString: 'assert(code.match(/\.html\(/g), "Make sure you are using <code>.html()</code> and not <code>.text()</code>.");'
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- text: 确保使用jQuery选择<code>button id="target4"</code> 。
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testString: 'assert(code.match(/\$\(\s*?(\"|\")#target4(\"|\")\s*?\)\.html\(/), "Make sure to select <code>button id="target4"</code> with jQuery.");'
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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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});
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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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