57 lines
1.7 KiB
Markdown
57 lines
1.7 KiB
Markdown
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---
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id: 587d7b83367417b2b2512b33
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title: Use the JavaScript Console to Check the Value of a Variable
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challengeType: 1
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videoUrl: ''
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localeTitle: 使用JavaScript控制台检查变量的值
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---
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## Description
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<section id="description"> Chrome和Firefox都有出色的JavaScript控制台，也称为DevTools，用于调试JavaScript。您可以在Chrome的菜单或FireFox菜单中的Web控制台中找到开发人员工具。如果您使用的是其他浏览器或手机，我们强烈建议您使用桌面版Firefox或Chrome。 <code>console.log()</code>方法将打印其括号内的输出“打印”到控制台，这可能是最有用的调试工具。将它放在代码中的关键点可以显示变量的中间值。在查看输出之前，最好先了解输出应该是什么。在整个代码中使用检查点来查看计算状态将有助于缩小问题所在。这是打印'Hello world！'的示例到控制台： <code>console.log('Hello world!');</code> </section>
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## Instructions
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<section id="instructions">使用<code>console.log()</code>方法打印代码中记录的变量<code>a</code>的值。 </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: 您的代码应使用<code>console.log()</code>来检查变量<code>a</code>的值。
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testString: 'assert(code.match(/console\.log\(a\)/g), "Your code should use <code>console.log()</code> to check the value of the variable <code>a</code>.");'
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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 a = 5;
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let b = 1;
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a++;
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// Add your code below this line
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let sumAB = a + b;
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console.log(sumAB);
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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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