ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
67 lines
1.6 KiB
Markdown
67 lines
1.6 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244b5
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title: 转义字符串中的引号
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/c2QvgSr'
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forumTopicId: 17568
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dashedName: escaping-literal-quotes-in-strings
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---
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# --description--
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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：`"`或者`'`时该怎么办呢?
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在 JavaScript 中，你可以通过在引号前面使用<dfn>反斜杠</dfn>（`\`）来转义引号。
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`var sampleStr = "Alan said, \"Peter is learning JavaScript\".";`
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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：
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`Alan said, "Peter is learning JavaScript".`
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# --instructions--
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使用<dfn>反斜杠</dfn>将一个字符串赋值给变量`myStr`，打印到控制台，输出为：
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`I am a "double quoted" string inside "double quotes".`
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# --hints--
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你的代码中应该包含两个双引号 (`"`) 以及四个转义的双引 (`\"`)。
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```js
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assert(code.match(/\\"/g).length === 4 && code.match(/[^\\]"/g).length === 2);
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```
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变量 myStr 应该包含字符串`I am a "double quoted" string inside "double quotes".`。
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```js
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assert(myStr === 'I am a "double quoted" string inside "double quotes".');
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```
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# --seed--
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## --after-user-code--
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```js
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(function(){
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if(typeof myStr === 'string') {
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console.log("myStr = \"" + myStr + "\"");
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} else {
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console.log("myStr is undefined");
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}
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})();
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```
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## --seed-contents--
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```js
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var myStr = ""; // Change this line
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```
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# --solutions--
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```js
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var myStr = "I am a \"double quoted\" string inside \"double quotes\".";
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```
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