---
id: 56533eb9ac21ba0edf2244de
title: Adding a Default Option in Switch Statements
challengeType: 1
guideUrl: 'https://chinese.freecodecamp.org/guide/certificates/adding-a-default-option-in-switch-statements'
videoUrl: ''
localeTitle: 在交换机语句中添加默认选项
---
## Description
在switch语句中，您可能无法将所有可能的值指定为case语句。相反，您可以添加default语句，如果找不到匹配的case语句，将执行该语句。可以把它想象成if/else链中的最后一个else语句。 default语句应该是最后一种情况。 switch（num）{
案例值1：
语句1;
打破;
案例值2：
语句2;
打破;
...
默认：
defaultStatement;
打破;
}
## Instructions
写一个switch语句来设置以下条件的answer ：
"a" - “苹果”
"b" - “鸟”
"c" - “猫”
default - “东西”
## Tests
```yml
tests:
- text: switchOfStuff("a")的值应为“apple”
testString: 'assert(switchOfStuff("a") === "apple", "switchOfStuff("a") should have a value of "apple"");'
- text: switchOfStuff("b")的值应为“bird”
testString: 'assert(switchOfStuff("b") === "bird", "switchOfStuff("b") should have a value of "bird"");'
- text: switchOfStuff("c")的值应为“cat”
testString: 'assert(switchOfStuff("c") === "cat", "switchOfStuff("c") should have a value of "cat"");'
- text: switchOfStuff("d")的值应为“stuff”
testString: 'assert(switchOfStuff("d") === "stuff", "switchOfStuff("d") should have a value of "stuff"");'
- text: switchOfStuff(4)的值应为“stuff”
testString: 'assert(switchOfStuff(4) === "stuff", "switchOfStuff(4) should have a value of "stuff"");'
- text: 您不应该使用任何if或else语句
testString: 'assert(!/else/g.test(code) || !/if/g.test(code), "You should not use any if or else statements");'
- text: 您应该使用default语句
testString: 'assert(switchOfStuff("string-to-trigger-default-case") === "stuff", "You should use a default statement");'
- text: 你应该至少有3个break语句
testString: 'assert(code.match(/break/g).length > 2, "You should have at least 3 break statements");'
```
## Challenge Seed
```js
function switchOfStuff(val) {
var answer = "";
// Only change code below this line
// Only change code above this line
return answer;
}
// Change this value to test
switchOfStuff(1);
```
## Solution
```js
// solution required
```