---
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
我们还可以使用+=运算符将字符串连接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。 注意
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。
## Instructions
通过连接这两个字符串来构建myStr几行： "This is the first sentence. "和"This is the second sentence."使用+=运算符。使用+=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myStr ，然后添加第二个字符串。
## Tests
```yml
tests:
- text: myStr应该有一个值This is the first sentence. This is the second sentence.
testString: 'assert(myStr === "This is the first sentence. This is the second sentence.", "myStr should have a value of This is the first sentence. This is the second sentence.");'
- text: 使用+=运算符构建myStr
testString: 'assert(code.match(/\w\s*\+=\s*[""]/g).length > 1 && code.match(/\w\s*\=\s*[""]/g).length > 1, "Use the += operator to build myStr");'
```
## Challenge Seed
```js
// Example
var ourStr = "I come first. ";
ourStr += "I come second.";
// Only change code below this line
var myStr;
```
### After Test
```js
console.info('after the test');
```
## Solution
```js
// solution required
```