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循环

go
	for j := 7; j <= 9; j++ {
		fmt.Println(j)
	}
go
	i := 1
	for i <= 3 {
		fmt.Println(i)
		i = i + 1
	}

    for {
		fmt.Println("loop")
		break
	}

while

go 没有 while,但是可以实现 while 的效果

go
// condition 是个 bool
for condition {

}

甚至 condition 也可以不要

go
for {

}