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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                > 匿名函數即沒有名字的函數,常用于實現回調函數、閉包等應用。 [TOC] ## 直接調用 ~~~ func() { fmt.Printf("func 1\n") }() // 有參數的情況下,后面是傳入對應的參數 func(x int) { fmt.Printf("x is %d\n", x) }(3) ~~~ ## 將匿名函數賦值給變量 ~~~ // 定義一個閉包,并將閉包函數賦值給變量f1、f2 num := 0 //var f1 func() var f2 func(x int, y int) int f1 := func() { // 只直接引用上下文環境 num ++ } f2 = func(x int, y int) int { return x+y } // 執行結果 f1() f1() fmt.Println(num) total := f2(2,3) fmt.Println(total) ~~~ ## 將匿名函數用作回調函數 ~~~ package main import "fmt" func main() { //調用函數,對每個元素后面都加上a標識 arr := []string{"1", "2", "3"} fmt.Println(visit(arr, func(v string) string { v += "a" return v })) //調用函數,對每個元素后面都加上b標識 fmt.Println(visit(arr, func(v string) string { v += "b" return v })) } //定義一個函數,遍歷切片元素,對每個元素進行處理 func visit(list []string, f func(string) string) string { str := "" for _, value := range list { str += f(value) } return str } ~~~ > 運行結果 ~~~ 1a2a3a 1b2b3b ~~~ ## 將匿名函數作為閉包 > 一個函數和與其相關的引用環境結合組成的實體 ~~~ package main import "fmt" func main() { var f = Adder() fmt.Println(f(1), "-") fmt.Println(f(20), "-") fmt.Println(f(300), "-") } func Adder() func(int) int { var x = 0 return func(delta int) int { x += delta return x } } ~~~ > 運行結果 ~~~ 1 - 21 - 321 - ~~~
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