freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-an.../basic-javascript/constructing-strings-with-v...

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---
id: 56533eb9ac21ba0edf2244b9
title: 用变量构造字符串
challengeType: 1
videoUrl: 'https://scrimba.com/c/cqk8rf4'
forumTopicId: 16805
dashedName: constructing-strings-with-variables
---
# --description--
有时候你需要创建一个类似[Mad Libs](https://en.wikipedia.org/wiki/Mad_Libs)(填词游戏)风格的字符串。通过使用连接运算符`+`,你可以插入一个或多个变量来组成一个字符串。
# --instructions--
把你的名字赋值给变量`myName`,然后把变量`myName`插入到字符串`"My name is "`和`" and I am well!"`之间,并把连接后的结果赋值给变量`myStr`。
# --hints--
`myName`至少要包含三个字符。
```js
assert(typeof myName !== 'undefined' && myName.length > 2);
```
使用两个`+`操作符创建包含`myName`的`myStr`变量。
```js
assert(code.match(/["']\s*\+\s*myName\s*\+\s*["']/g).length > 0);
```
# --seed--
## --after-user-code--
```js
(function(){
var output = [];
if(typeof myName === 'string') {
output.push('myName = "' + myName + '"');
} else {
output.push('myName is not a string');
}
if(typeof myStr === 'string') {
output.push('myStr = "' + myStr + '"');
} else {
output.push('myStr is not a string');
}
return output.join('\n');
})();
```
## --seed-contents--
```js
// Only change code below this line
var myName;
var myStr;
```
# --solutions--
```js
var myName = "Bob";
var myStr = "My name is " + myName + " and I am well!";
```