74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244af
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title: Compound Assignment With Augmented Addition
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challengeType: 1
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videoUrl: ''
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localeTitle: 具有增强加法的复合赋值
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---
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## Description
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<section id="description">在编程中，通常使用赋值来修改变量的内容。请记住，首先评估等号右侧的所有内容，因此我们可以说： <code>myVar = myVar + 5;</code>添加<code>5</code>到<code>myVar</code> 。由于这是一种常见的模式，因此存在一步完成数学运算和赋值的运算符。一个这样的运算符是<code>+=</code>运算符。 <blockquote> var myVar = 1; <br> myVar + = 5; <br>的console.log（myVar的）; //返回6 </blockquote></section>
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## Instructions
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<section id="instructions">转换<code>a</code> ， <code>b</code>和<code>c</code>的赋值以使用<code>+=</code>运算符。 </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>a</code>应该等于<code>15</code>
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testString: 'assert(a === 15, "<code>a</code> should equal <code>15</code>");'
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- text: <code>b</code>应该等于<code>26</code>
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testString: 'assert(b === 26, "<code>b</code> should equal <code>26</code>");'
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- text: <code>c</code>应该等于<code>19</code>
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testString: 'assert(c === 19, "<code>c</code> should equal <code>19</code>");'
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- text: 您应该为每个变量使用<code>+=</code>运算符
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testString: 'assert(code.match(/\+=/g).length === 3, "You should use the <code>+=</code> operator for each variable");'
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- text: 不要修改行上方的代码
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testString: 'assert(/var a = 3;/.test(code) && /var b = 17;/.test(code) && /var c = 12;/.test(code), "Do not modify the code above the line");'
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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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var a = 3;
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var b = 17;
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var c = 12;
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// Only modify code below this line
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a = a + 12;
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b = 9 + b;
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c = c + 7;
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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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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