67 lines
3.3 KiB
Markdown
67 lines
3.3 KiB
Markdown
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---
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id: ac6993d51946422351508a41
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title: Truncate a String
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isRequired: true
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challengeType: 5
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videoUrl: ''
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localeTitle: 截断字符串
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---
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## Description
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<section id="description">如果字符串（第一个参数）长于给定的最大字符串长度（第二个参数），则截断该字符串。返回带有<code>...</code>结尾的截断字符串。如果卡住，请记得使用<a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> 。编写自己的代码。 </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: '<code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code>应该返回“A-tisket ......”。'
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testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", 8) === "A-tisket...", "<code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code> should return "A-tisket...".");'
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- text: '<code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code>应该回归“Peter Piper ......”。'
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testString: 'assert(truncateString("Peter Piper picked a peck of pickled peppers", 11) === "Peter Piper...", "<code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code> should return "Peter Piper...".");'
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- text: '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code>应该返回“A-tisket a-tasket A green and yellow basket”。'
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testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length) === "A-tisket a-tasket A green and yellow basket", "<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code> should return "A-tisket a-tasket A green and yellow basket".");'
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- text: '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code>应返回“A-tisket a-tasket A green and yellow basket”。'
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testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2) === "A-tisket a-tasket A green and yellow basket", "<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code> should return "A-tisket a-tasket A green and yellow basket".");'
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- text: '<code>truncateString("A-", 1)</code>应返回“A ...”。'
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testString: 'assert(truncateString("A-", 1) === "A...", "<code>truncateString("A-", 1)</code> should return "A...".");'
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- text: '<code>truncateString("Absolutely Longer", 2)</code>应返回“Ab ...”。'
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testString: 'assert(truncateString("Absolutely Longer", 2) === "Ab...", "<code>truncateString("Absolutely Longer", 2)</code> should return "Ab...".");'
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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='js-seed'>
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```js
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function truncateString(str, num) {
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// Clear out that junk in your trunk
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return str;
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}
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truncateString("A-tisket a-tasket A green and yellow basket", 8);
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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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