英文字母对应的Unicode编码

A~Z ：65~90a~z ：97~1220～9 : 48～57

如果想要知道字符串中的值是否是⼩写英⽂字符，不使⽤⼯具包的⼀种⽅法就是使⽤Unicode编码值，举例：

package mainimport ( \"fmt\")

func main() {

// str := \"helloworld\" //返回str is all lower char str := \"hello4world\" //返回str is not all lower char for _, s := range str{

if !(s > 96 && s < 123){

fmt.Println(\"str is not all lower char\") return } }

fmt.Println(\"str is all lower char\")}

当然还有更简单的⼀种⽅法：

package mainimport ( \"fmt\")

func main() {

str := \"helloworld\" //返回str is all lower char

// str := \"hello4world\" //返回str is not all lower char for _, s := range str{

if !('a' <= s && s <= 'z'){

fmt.Println(\"str is not all lower char\") return } }

fmt.Println(\"str is all lower char\")}