150 lines
2.5 KiB
Markdown
150 lines
2.5 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244df
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title: 在 Switch 语句添加多个相同选项
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/cdBKWCV'
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forumTopicId: 18242
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dashedName: multiple-identical-options-in-switch-statements
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---
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# --description--
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如果你忘了给 `switch` 的每一条 `case` 添加 `break`，那么后续的 `case` 会一直执行，直到遇见 `break` 为止。 如果你想为 `switch` 中的多个不同的输入设置相同的结果，可以这样写：
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```js
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var result = "";
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switch(val) {
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case 1:
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case 2:
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case 3:
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result = "1, 2, or 3";
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break;
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case 4:
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result = "4 alone";
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}
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```
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这样，1、2、3 都会有相同的结果。
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# --instructions--
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请写一个 switch 语句，按如下条件设置 `answer` ：
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`1-3` - `Low`
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`4-6` - `Mid`
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`7-9` - `High`
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**提示：** 你的 `case` 应写全范围中的每一个数字。
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# --hints--
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`sequentialSizes(1)` 应该返回字符串 `Low`
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```js
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assert(sequentialSizes(1) === 'Low');
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```
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`sequentialSizes(2)` 应该返回字符串 `Low`
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```js
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assert(sequentialSizes(2) === 'Low');
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```
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`sequentialSizes(3)` 应该返回字符串 `Low`
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```js
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assert(sequentialSizes(3) === 'Low');
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```
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`sequentialSizes(4)` 应该返回字符串 `Mid`
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```js
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assert(sequentialSizes(4) === 'Mid');
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```
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`sequentialSizes(5)` 应该返回字符串 `Mid`
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```js
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assert(sequentialSizes(5) === 'Mid');
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```
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`sequentialSizes(6)` 应该返回字符串 `Mid`
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```js
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assert(sequentialSizes(6) === 'Mid');
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```
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`sequentialSizes(7)` 应该返回字符串 `High`
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```js
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assert(sequentialSizes(7) === 'High');
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```
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`sequentialSizes(8)` 应该返回字符串 `High`
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```js
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assert(sequentialSizes(8) === 'High');
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```
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`sequentialSizes(9)` 应该返回字符串 `High`
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```js
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assert(sequentialSizes(9) === 'High');
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```
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你不应使用 `if` 或 `else` 语句。
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```js
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assert(!/else/g.test(code) || !/if/g.test(code));
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```
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你应该编写 9 个`case`语句。
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```js
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assert(code.match(/case/g).length === 9);
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```
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# --seed--
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## --seed-contents--
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```js
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function sequentialSizes(val) {
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var answer = "";
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// Only change code below this line
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// Only change code above this line
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return answer;
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}
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sequentialSizes(1);
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```
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# --solutions--
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```js
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function sequentialSizes(val) {
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var answer = "";
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switch(val) {
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case 1:
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case 2:
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case 3:
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answer = "Low";
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break;
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case 4:
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case 5:
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case 6:
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answer = "Mid";
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break;
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case 7:
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case 8:
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case 9:
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answer = "High";
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}
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return answer;
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}
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```
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