fora基础用法

num := 1
for num <= 3 {
    log.Println(num)
    num++
}

for n := 1; n <= 3; n++ {
    log.Println(n)
}

for true {
    log.Println(“我是一个死循环”)
}

Range

可以用来遍历数组，切片，map，string和channel

#遍历字符串
str := "www.packagemain.com"
for _, v := range str {
    log.Println(string(v))
}

for k, v := range maps {
    log.Println(k)
    log.Println(v)
}

数组遍历

nums := []int{1, 2, 3}
for k, v := range nums {
    fmt.Printf("key: %v , value: %v  \n", k, v)
}