freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/debugging/use-the-javascript-console-to-check-the-value-of-a-variable.chinese.md

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---
id: 587d7b83367417b2b2512b33
title: Use the JavaScript Console to Check the Value of a Variable
challengeType: 1
videoUrl: ''
localeTitle: 使用JavaScript控制台检查变量的值
---
## Description
<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&#39;Hello world&#39;的示例到控制台: <code>console.log(&#39;Hello world!&#39;);</code> </section>
## Instructions
<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>
## Tests
<section id='tests'>
```yml
tests:
- text: 您的代码应使用<code>console.log()</code>来检查变量<code>a</code>的值。
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>.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
let a = 5;
let b = 1;
a++;
// Add your code below this line
let sumAB = a + b;
console.log(sumAB);
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>