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freeCodeCamp/guide/chinese/mathematics/what-is-the-range-of-a-function/index.md
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---
title: What Is the Range of a Function
localeTitle: 什么是函数的范围
---
## 什么是函数的范围
在替换域之后函数的范围是因变量的所有可能结果值的完整集合。换句话说范围是在替换所有可能的x值后得到的y值。
例如对于y = sqrtx + 2 此函数的范围是y> = 0 。
#### 更多信息:
[函数的域和范围](https://www.intmath.com/functions-and-graphs/2a-domain-and-range.php)