74 lines
2.2 KiB
Markdown
74 lines
2.2 KiB
Markdown
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---
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id: bad87fee1348bd9aedf08830
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title: Add Placeholder Text to a Text Field
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challengeType: 0
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guideUrl: 'https://chinese.freecodecamp.org/guide/certificates/add-placeholder-text-to-a-text-field'
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videoUrl: ''
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localeTitle: 将占位符文本添加到文本字段
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---
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## Description
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<section id="description">占位符文本是在用户输入任何内容之前在<code>input</code>元素中显示的内容。您可以像这样创建占位符文本： <code><input type="text" placeholder="this is placeholder text"></code> </section>
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## Instructions
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<section id="instructions">将文本<code>input</code>的<code>placeholder</code>值设置为“cat photo URL”。 </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: 将<code>placeholder</code>属性添加到现有文本<code>input</code>元素。
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testString: 'assert($("input[placeholder]").length > 0, "Add a <code>placeholder</code> attribute to the existing text <code>input</code> element.");'
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- text: 将占位符属性的值设置为“cat photo URL”。
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testString: 'assert($("input") && $("input").attr("placeholder") && $("input").attr("placeholder").match(/cat\s+photo\s+URL/gi), "Set the value of your placeholder attribute to "cat photo URL".");'
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- text: 完成的<code>input</code>元素应该具有有效的语法。
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testString: 'assert($("input[type=text]").length > 0 && code.match(/<input((\s+\w+(\s*=\s*(?:".*?"|".*?"|[\^"">\s]+))?)+\s*|\s*)\/?>/gi), "The finished <code>input</code> element should have valid syntax.");'
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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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<h2>CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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<input type="text">
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</main>
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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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