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package main
import "fmt"
func main() {
//第一次1，select选择一个能执行的即 ch<-i,把1放入通道，第二次，不能放入，取出，第三次再放入，第四次再取出
ch := make(chan int, 1)
for i := 1; i <= 10; i++ {
select {
case x := <-ch:
fmt.Println(x)
case ch <- i:
}