package mainimport "fmt"func main() {    workChan := make(chan int, 10000) //存储chan    controlChan := make(chan int, 100) //控制chan    var work int    var mange int　　    for i := 0; i < 100; i++ {        go func() {            defer func() {controlChan <- 1}()            for j := 0; j < 100; j++ {                workChan <- i            }        }()    }    for range controlChan {        mange++ //当控制chal 满 则关闭控制与工作channel        if mange == 100 {            close(workChan)            close(controlChan)        }    }    for range workChan {        work++    }    fmt.Println("channel长度", work)}