123 lines
3.0 KiB
Markdown
123 lines
3.0 KiB
Markdown
---
|
||
id: 56533eb9ac21ba0edf2244df
|
||
challengeType: 1
|
||
videoUrl: 'https://scrimba.com/c/cdBKWCV'
|
||
forumTopicId: 18242
|
||
localeTitle: 在 Switch 语句添加多个相同选项
|
||
---
|
||
|
||
## Description
|
||
<section id='description'>
|
||
如果你忘了给<code>switch</code>的每一条<code>case</code>添加<code>break</code>，那么直到遇见<code>break</code>为止，后续的<code>case</code>会一直执行。如果你想为多个不同的输入设置相同的结果，可以这样写：
|
||
|
||
```js
|
||
switch(val) {
|
||
case 1:
|
||
case 2:
|
||
case 3:
|
||
result = "1, 2, or 3";
|
||
break;
|
||
case 4:
|
||
result = "4 alone";
|
||
}
|
||
```
|
||
|
||
这样，1、2、3 都会有相同的结果。
|
||
</section>
|
||
|
||
## Instructions
|
||
<section id='instructions'>
|
||
请写一个<code>switch</code>语句，根据输入的<code>val</code>的范围得出对应的<code>answer</code>：<br><code>1-3</code> - "Low"<br><code>4-6</code> - "Mid"<br><code>7-9</code> - "High"
|
||
<strong>提示：</strong><br>你的<code>case</code>应基于范围中的每一个数字编写。
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>sequentialSizes(1)</code>应该返回 "Low"。
|
||
testString: assert(sequentialSizes(1) === "Low");
|
||
- text: <code>sequentialSizes(2)</code>应该返回 "Low"。
|
||
testString: assert(sequentialSizes(2) === "Low");
|
||
- text: <code>sequentialSizes(3)</code>应该返回 "Low"。
|
||
testString: assert(sequentialSizes(3) === "Low");
|
||
- text: <code>sequentialSizes(4)</code>应该返回 "Mid"。
|
||
testString: assert(sequentialSizes(4) === "Mid");
|
||
- text: <code>sequentialSizes(5)</code>应该返回 "Mid"。
|
||
testString: assert(sequentialSizes(5) === "Mid");
|
||
- text: <code>sequentialSizes(6)</code>应该返回 "Mid"。
|
||
testString: assert(sequentialSizes(6) === "Mid");
|
||
- text: <code>sequentialSizes(7)</code>应该返回 "High"。
|
||
testString: assert(sequentialSizes(7) === "High");
|
||
- text: <code>sequentialSizes(8)</code>应该返回 "High"。
|
||
testString: assert(sequentialSizes(8) === "High");
|
||
- text: <code>sequentialSizes(9)</code>应该返回 "High"。
|
||
testString: assert(sequentialSizes(9) === "High");
|
||
- text: 你不应使用<code>if</code>或<code>else</code>语句。
|
||
testString: assert(!/else/g.test(code) || !/if/g.test(code));
|
||
- text: 你应该编写 9 个<code>case</code>语句。
|
||
testString: assert(code.match(/case/g).length === 9);
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
function sequentialSizes(val) {
|
||
var answer = "";
|
||
// Only change code below this line
|
||
|
||
|
||
|
||
// Only change code above this line
|
||
return answer;
|
||
}
|
||
|
||
// Change this value to test
|
||
sequentialSizes(1);
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
|
||
```js
|
||
function sequentialSizes(val) {
|
||
var answer = "";
|
||
|
||
switch(val) {
|
||
case 1:
|
||
case 2:
|
||
case 3:
|
||
answer = "Low";
|
||
break;
|
||
case 4:
|
||
case 5:
|
||
case 6:
|
||
answer = "Mid";
|
||
break;
|
||
case 7:
|
||
case 8:
|
||
case 9:
|
||
answer = "High";
|
||
}
|
||
|
||
return answer;
|
||
}
|
||
```
|
||
|
||
</section>
|