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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                > `init函數`用于包的初始化,常用于初始化包中的變量;這個初始化在`package xxx`的時候完成,也就是在main執行前完成; ## 同一包多個init的執行順序 > 多個init函數,誰放在前面誰先執行 ~~~ package main import "fmt" func main() { fmt.Println("do in main") } func init() { fmt.Println("do in init1") } func init() { fmt.Println("do in init2") } ~~~ > 運行結果 ~~~ do in init1 do in init2 do in main ~~~ ## 不同包的init的執行順序 ### 例1 (依賴關系) > 導入含依賴關系的包,根據先進后出方式執行 **main.go** ~~~ package main import ( "fmt" _ "gintest/level1" ) func main() { fmt.Println("I am in main") } ~~~ **/level1/level1.go** ~~~ package level1 import ( "fmt" _ "gintest/level2" ) func init() { fmt.Println("I am in level1") } ~~~ **/level2/level2.go** ~~~ package level2 import "fmt" func init() { fmt.Println("I am in level2") } ~~~ > 運行結果 ~~~ I am in level2 I am in level1 I am in main ~~~ > 執行過程 ![](https://img.kancloud.cn/d6/cf/d6cfefac1a462103f5bacc8c35099cea_654x319.png) ### 例2 (非依賴關系) > 導入非依賴關系的包,先導入先執行 ~~~ // main.go package main import ( "fmt" _ "gintest/level1" _ "gintest/level2" ) func main() { fmt.Println("I am in main") } ~~~ > 執行結果 ~~~ I am in level1 I am in level2 I am in main ~~~
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