78 lines
2.0 KiB
Markdown
78 lines
2.0 KiB
Markdown
---
|
||
id: 56533eb9ac21ba0edf2244b5
|
||
challengeType: 1
|
||
videoUrl: 'https://scrimba.com/c/c2QvgSr'
|
||
forumTopicId: 17568
|
||
title: 转义字符串中的引号
|
||
---
|
||
|
||
## Description
|
||
<section id='description'>
|
||
定义一个字符串必须要用单引号或双引号来包裹它。那么当你的字符串里面包含：<code>"</code>或者<code>'</code>时该怎么办呢?
|
||
在 JavaScript 中，你可以通过在引号前面使用<dfn>反斜杠</dfn>（<code>\</code>）来转义引号。
|
||
<code>var sampleStr = "Alan said, \"Peter is learning JavaScript\".";</code>
|
||
有了转义符号，JavaScript 就知道这个单引号或双引号并不是字符串的结尾，而是字符串内的字符。所以，上面的字符串打印到控制台的结果为：
|
||
<code>Alan said, "Peter is learning JavaScript".</code>
|
||
</section>
|
||
|
||
## Instructions
|
||
<section id='instructions'>
|
||
使用<dfn>反斜杠</dfn>将一个字符串赋值给变量<code>myStr</code>，打印到控制台，输出为：
|
||
<code>I am a "double quoted" string inside "double quotes".</code>
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 你的代码中应该包含两个双引号 (<code>"</code>) 以及四个转义的双引 (<code>\"</code>)。
|
||
testString: assert(code.match(/\\"/g).length === 4 && code.match(/[^\\]"/g).length === 2);
|
||
- text: 变量 myStr 应该包含字符串<code>I am a "double quoted" string inside "double quotes".</code>。
|
||
testString: assert(myStr === "I am a \"double quoted\" string inside \"double quotes\".");
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
var myStr = ""; // Change this line
|
||
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
### After Test
|
||
<div id='js-teardown'>
|
||
|
||
```js
|
||
(function(){
|
||
if(typeof myStr === 'string') {
|
||
console.log("myStr = \"" + myStr + "\"");
|
||
} else {
|
||
console.log("myStr is undefined");
|
||
}
|
||
})();
|
||
```
|
||
|
||
</div>
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
|
||
```js
|
||
var myStr = "I am a \"double quoted\" string inside \"double quotes\".";
|
||
```
|
||
|
||
</section>
|