57 lines
		
	
	
		
			1.7 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			57 lines
		
	
	
		
			1.7 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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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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| 
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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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| 
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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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| 
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| ## Tests
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| <section id='tests'>
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| 
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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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| ```
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| 
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| </section>
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| 
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| ## Challenge Seed
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| <section id='challengeSeed'>
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| 
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| <div id='js-seed'>
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| 
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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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| 
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| 
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| let sumAB = a + b;
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| console.log(sumAB);
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| 
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| ```
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| 
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| </div>
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| 
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| 
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| 
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| </section>
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| 
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| ## Solution
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| <section id='solution'>
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| 
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| ```js
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| // solution required
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| ```
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| </section>
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