69 lines
2.1 KiB
Markdown
69 lines
2.1 KiB
Markdown
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---
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id: 56533eb9ac21ba0edf2244b7
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title: Concatenating Strings with Plus Operator
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challengeType: 1
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videoUrl: ''
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localeTitle: 用Plus运算符连接字符串
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---
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## Description
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<section id="description">在JavaScript中，当<code>+</code>运算符与<code>String</code>值一起使用时，它被称为<dfn>连接</dfn>运算符。您可以通过<dfn>将</dfn>它们<dfn>连接</dfn>在一起来构建其他字符串中的新字符串。 <strong>例</strong> <blockquote> “我叫艾伦，'+'我连接起来。” </blockquote> <strong>注意</strong> <br>留意空间。连接不会在连接字符串之间添加空格，因此您需要自己添加它们。 </section>
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## Instructions
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<section id="instructions">从字符串构建<code>myStr</code> <code>"This is the start. "</code>和<code>"This is the end."</code>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>myStr</code>应该有一个值<code>This is the start. This is the end.</code>
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testString: 'assert(myStr === "This is the start. This is the end.", "<code>myStr</code> should have a value of <code>This is the start. This is the end.</code>");'
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- text: 使用<code>+</code>运算符构建<code>myStr</code>
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testString: 'assert(code.match(/([""]).*([""])\s*\+\s*([""]).*([""])/g).length > 1, "Use the <code>+</code> operator to build <code>myStr</code>");'
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- text: 应使用<code>var</code>关键字创建<code>myStr</code> 。
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testString: 'assert(/var\s+myStr/.test(code), "<code>myStr</code> should be created using the <code>var</code> keyword.");'
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- text: 确保将结果分配给<code>myStr</code>变量。
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testString: 'assert(/myStr\s*=/.test(code), "Make sure to assign the result to the <code>myStr</code> variable.");'
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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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// Example
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var ourStr = "I come first. " + "I come second.";
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// Only change code below this line
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var myStr;
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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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