Go语言 之Goexit

package main

import (
    "fmt"
    "runtime"
)

func main() {
    go func() {
        defer fmt.Println("defer A")
        func() {
            defer fmt.Println("defer B")
            //结束goroutine
            runtime.Goexit()
            fmt.Println("B")
        }()
        fmt.Println("A")
    }()

    //保证main不结束执行
    for {

    }
    //执行结果：
    //defer B
    //defer A

}

调用 runtime.Goexit() 将立即终止当前 goroutine 执⾏，调度器确保所有已注册 defer延迟调用被执行。