---
id: cf1111c1c12feddfaeb3bdef
title: Use Conditional Logic with If Statements
challengeType: 1
videoUrl: ''
localeTitle: 使用条件逻辑和If语句
---
## Description
If语句用于在代码中做出决定。关键字if告诉JavaScript在括号中定义的特定条件下执行花括号中的代码。这些条件称为Boolean条件，它们可能只是true或false 。当条件计算结果为true ，程序将执行花括号内的语句。当布尔条件的计算结果为false ，大括号内的语句将不会执行。 伪代码 if（ condition为true ）{
声明被执行
}
例 功能测试（myCondition）{
if（myCondition）{
回归“这是真的”;
}
返回“这是假的”;
}
测试（真）; //返回“这是真的”
测试（假）; //返回“这是假的”
当使用值true调用test ， if语句将评估myCondition以查看它是否为true 。因为它是true ，函数返回"It was true" 。当我们使用false值调用test时， myCondition 不为 true并且不执行花括号中的语句，函数返回"It was false" 。
## Instructions
在函数内部创建一个if语句"Yes, that was true"如果参数wasThatTrue为true则返回"Yes, that was true" "No, that was false"否则返回"No, that was false" 。
## Tests
```yml
tests:
- text: trueOrFalse应该是一个函数
testString: 'assert(typeof trueOrFalse === "function", "trueOrFalse should be a function");'
- text: trueOrFalse(true)应该返回一个字符串
testString: 'assert(typeof trueOrFalse(true) === "string", "trueOrFalse(true) should return a string");'
- text: trueOrFalse(false)应该返回一个字符串
testString: 'assert(typeof trueOrFalse(false) === "string", "trueOrFalse(false) should return a string");'
- text: trueOrFalse(true)应该返回“是的，那是真的”
testString: 'assert(trueOrFalse(true) === "Yes, that was true", "trueOrFalse(true) should return "Yes, that was true"");'
- text: trueOrFalse(false)应该返回“No，that was false”
testString: 'assert(trueOrFalse(false) === "No, that was false", "trueOrFalse(false) should return "No, that was false"");'
```
## Challenge Seed
```js
// Example
function ourTrueOrFalse(isItTrue) {
if (isItTrue) {
return "Yes, it's true";
}
return "No, it's false";
}
// Setup
function trueOrFalse(wasThatTrue) {
// Only change code below this line.
// Only change code above this line.
}
// Change this value to test
trueOrFalse(true);
```
## Solution
```js
// solution required
```