62 lines
1.2 KiB
Markdown
62 lines
1.2 KiB
Markdown
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---
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title: Variadic Functions
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localeTitle: 变量函数
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---
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## 变量函数
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可变参数函数是可以使用任意数量的尾随参数调用的函数。
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当我们处理网络应用时，这是一个有用的功能。
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有时我们不需要将多少元素传递给HTML模板引擎。
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以下是有关varidic函数如何工作的基础知识：
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```go
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package main
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import "fmt"
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func printFruits(fruits ...string) {
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for _, fruit := range fruits{
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fmt.Println(fruit)
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}
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}
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func main() {
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printFruits("apple", "bannana")
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printFruits("papaya", "coconut", "pear", "pineapple")
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berries := []string{"blueberry", "strawberry", "raspberry"}
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printFruits(berries...)
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}
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```
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首先，在printFruits中，我们用\[... string\]定义了参数个数。
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这告诉Go这个函数接受任意数量的字符串参数。
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对printFruits的前两次调用显示该函数将打印每个字符串，即使我们传递的是不同数量的参数。
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```text
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apple
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bannana
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...
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papaya
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coconut
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pear
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...
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```
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这也适用于切片。
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要使用带切片的vardiac函数，我们将训练点添加到调用中。
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```go
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printFruits(berries...)
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```
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```text
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blueberry
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strawberry
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raspberry
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```
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