62 lines
1.9 KiB
Markdown
62 lines
1.9 KiB
Markdown
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---
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id: 587d7b7e367417b2b2512b23
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title: Use the parseInt Function
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challengeType: 1
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videoUrl: ''
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localeTitle: 使用parseInt函数
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---
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## Description
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<section id="description"> <code>parseInt()</code>函数解析字符串并返回一个整数。这是一个例子： <code>var a = parseInt("007");</code>上面的函数将字符串“007”转换为整数7.如果字符串中的第一个字符无法转换为数字，则返回<code>NaN</code> 。 </section>
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## Instructions
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<section id="instructions">在<code>convertToInteger</code>函数中使用<code>parseInt()</code> ，以便将输入字符串<code>str</code>转换为整数，然后返回它。 </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>convertToInteger</code>应该使用<code>parseInt()</code>函数
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testString: 'assert(/parseInt/g.test(code), "<code>convertToInteger</code> should use the <code>parseInt()</code> function");'
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- text: <code>convertToInteger("56")</code>应该返回一个数字
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testString: 'assert(typeof(convertToInteger("56")) === "number", "<code>convertToInteger("56")</code> should return a number");'
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- text: <code>convertToInteger("56")</code>应该返回56
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testString: 'assert(convertToInteger("56") === 56, "<code>convertToInteger("56")</code> should return 56");'
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- text: <code>convertToInteger("77")</code>应该返回77
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testString: 'assert(convertToInteger("77") === 77, "<code>convertToInteger("77")</code> should return 77");'
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- text: <code>convertToInteger("JamesBond")</code>应该返回NaN
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testString: 'assert.isNaN(convertToInteger("JamesBond"), "<code>convertToInteger("JamesBond")</code> should return NaN");'
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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 convertToInteger(str) {
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}
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convertToInteger("56");
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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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