freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.chinese.md

id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
56533eb9ac21ba0edf2244b8	Concatenating Strings with the Plus Equals Operator	1		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

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>");'

Challenge Seed

// Example
var ourStr = "I come first. ";
ourStr += "I come second.";

// Only change code below this line

var myStr;

After Test

console.info('after the test');

Solution

// solution required