76 lines
1.7 KiB
Markdown
76 lines
1.7 KiB
Markdown
|
---
|
||
|
|
id: 56533eb9ac21ba0edf2244b9
|
||
|
|
title: 用變量構造字符串
|
||
|
|
challengeType: 1
|
||
|
|
videoUrl: 'https://scrimba.com/c/cqk8rf4'
|
||
|
|
forumTopicId: 16805
|
||
|
|
dashedName: constructing-strings-with-variables
|
||
|
|
---
|
||
|
|
|
||
|
|
# --description--
|
||
|
|
|
||
|
|
有時候你需要創建一個類似 [Mad Libs](https://en.wikipedia.org/wiki/Mad_Libs)（填詞遊戲）風格的字符串。 通過使用連接運算符（`+`），你可以插入一個或多個變量來組成一個字符串。
|
||
|
|
|
||
|
|
例如：
|
||
|
|
|
||
|
|
```js
|
||
|
|
var ourName = "freeCodeCamp";
|
||
|
|
var ourStr = "Hello, our name is " + ourName + ", how are you?";
|
||
|
|
```
|
||
|
|
|
||
|
|
`ourStr` 值爲 `Hello, our name is freeCodeCamp, how are you?`
|
||
|
|
|
||
|
|
# --instructions--
|
||
|
|
|
||
|
|
把你的名字賦值給變量 `myName`，然後把變量 `myName` 插入到字符串 `My name is` 和 `and I am well!` 之間，並把連接後的結果賦值給變量 `myStr`。
|
||
|
|
|
||
|
|
# --hints--
|
||
|
|
|
||
|
|
`myName` 應該是一個至少有 3 個字符的字符串。
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert(typeof myName !== 'undefined' && myName.length > 2);
|
||
|
|
```
|
||
|
|
|
||
|
|
使用兩個 `+` 操作符創建包含 `myName` 的 `myStr` 變量。
|
||
|
|
|
||
|
|
```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!";
|
||
|
|
```
|