69 lines
2.0 KiB
Markdown
69 lines
2.0 KiB
Markdown
---
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id: 587d7b84367417b2b2512b35
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title: Catch Misspelled Variable and Function Names
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challengeType: 1
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forumTopicId: 301186
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localeTitle: 捕获拼错的变量名和函数名
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---
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## Description
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<section id='description'>
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<code>console.log()</code>和<code>typeof</code>方法是检查中间值和程序输出类型的两种主要方法。 现在是时候了解一下 bug 出现的常见的情形。一个语法级别的问题是打字太快带来的低级拼写错误。
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变量或函数名的错写、漏写或大小写弄混都会让浏览器尝试查找并不存在的东西，并报出“引用错误”。JavaScript 变量和函数名称区分大小写。
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</section>
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## Instructions
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<section id='instructions'>
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修复代码中的两个拼写错误，以便<code>netWorkingCapital</code>计算有效。
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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: '检查计算 netWorkingCapital 值时使用的两个变量的拼写是否正确，控制台应该输出 "Net working capital is: 2"。'
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testString: 'assert(netWorkingCapital === 2);'
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- text: 代码中不应存在拼写错误的变量。
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testString: assert(!code.match(/recievables/g));
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- text: 应在代码中声明并正确使用<code>receivables</code>变量。
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testString: assert(code.match(/receivables/g).length == 2);
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- text: 代码中不应存在拼写错误的变量。
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testString: assert(!code.match(/payable;/g));
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- text: 应在代码中声明并正确使用<code>payables</code>变量。
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testString: assert(code.match(/payables/g).length == 2);
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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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let receivables = 10;
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let payables = 8;
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let netWorkingCapital = recievables - payable;
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console.log(`Net working capital is: ${netWorkingCapital}`);
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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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let receivables = 10;
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let payables = 8;
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let netWorkingCapital = receivables - payables;
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console.log(`Net working capital is: ${netWorkingCapital}`);
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```
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</section>
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