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>
79 lines
1.3 KiB
Markdown
79 lines
1.3 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244ac
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title: 数字递增
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/ca8GLT9'
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forumTopicId: 18201
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dashedName: increment-a-number-with-javascript
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---
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# --description--
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使用`++`，我们可以很容易地对变量进行自增或者`+1`运算。
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`i++;`
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等效于
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`i = i + 1;`
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**注意**
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`i++;`这种写法，省去了书写`=`符号的必要。
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# --instructions--
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重写代码，使用`++`来对变量`myVar`进行自增操作。
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**提示**
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了解更多关于`++`运算符[Arithmetic operators - Increment (++)](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#%E9%80%92%E5%A2%9E_()).
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# --hints--
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`myVar`应该等于`88`。
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```js
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assert(myVar === 88);
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```
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`myVar = myVar + 1;`语句应该被修改。
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```js
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assert(/var\s*myVar\s*=\s*87;\s*\/*.*\s*myVar\+\+;/.test(code));
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```
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使用`++`运算符。
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```js
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assert(/[+]{2}\s*myVar|myVar\s*[+]{2}/.test(code));
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```
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不要修改注释上方的代码。
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```js
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assert(/var myVar = 87;/.test(code));
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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(z){return 'myVar = ' + z;})(myVar);
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```
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## --seed-contents--
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```js
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var myVar = 87;
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// Only change code below this line
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myVar = myVar + 1;
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```
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# --solutions--
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```js
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var myVar = 87;
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myVar++;
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```
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