66 lines
1.9 KiB
Markdown
66 lines
1.9 KiB
Markdown
|
---
|
||
|
|
id: 56533eb9ac21ba0edf2244b8
|
||
|
|
title: Concatenating Strings with the Plus Equals Operator
|
||
|
|
challengeType: 1
|
||
|
|
videoUrl: ''
|
||
|
|
localeTitle: 使用Plus Equals运算符连接字符串
|
||
|
|
---
|
||
|
|
|
||
|
|
## Description
|
||
|
|
<section id="description">我们还可以使用<code>+=</code>运算符将字符串<dfn>连接</dfn>到现有字符串变量的末尾。这对于在多行上打破长字符串非常有帮助。 <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>
|
||
|
|
|
||
|
|
## Instructions
|
||
|
|
<section id="instructions">通过连接这两个字符串来构建<code>myStr</code>几行： <code>"This is the first sentence. "</code>和<code>"This is the second sentence."</code>使用<code>+=</code>运算符。使用<code>+=</code>运算符，类似于它在编辑器中的显示方式。首先将第一个字符串分配给<code>myStr</code> ，然后添加第二个字符串。 </section>
|
||
|
|
|
||
|
|
## Tests
|
||
|
|
<section id='tests'>
|
||
|
|
|
||
|
|
```yml
|
||
|
|
tests:
|
||
|
|
- text: <code>myStr</code>应该有一个值<code>This is the first sentence. This is the second sentence.</code>
|
||
|
|
testString: 'assert(myStr === "This is the first sentence. This is the second sentence.", "<code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>");'
|
||
|
|
- text: 使用<code>+=</code>运算符构建<code>myStr</code>
|
||
|
|
testString: 'assert(code.match(/\w\s*\+=\s*[""]/g).length > 1 && code.match(/\w\s*\=\s*[""]/g).length > 1, "Use the <code>+=</code> operator to build <code>myStr</code>");'
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Challenge Seed
|
||
|
|
<section id='challengeSeed'>
|
||
|
|
|
||
|
|
<div id='js-seed'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
// Example
|
||
|
|
var ourStr = "I come first. ";
|
||
|
|
ourStr += "I come second.";
|
||
|
|
|
||
|
|
// Only change code below this line
|
||
|
|
|
||
|
|
var myStr;
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
### After Test
|
||
|
|
<div id='js-teardown'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
console.info('after the test');
|
||
|
|
```
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Solution
|
||
|
|
<section id='solution'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
// solution required
|
||
|
|
```
|
||
|
|
</section>
|