import (	"fmt"	"strings")func main() {	//检查字符串传是否包含指定字符,返回true或者false	fmt.Println(strings.Contains("hello go", "hello"))	//组合切片成一个字符串	fmt.Println(strings.Join([]string{"a", "1"}, ","))	//查找字符串返回索引	fmt.Println(strings.Index("hello go", "go"))	//追加字符串	fmt.Println(strings.Repeat("go", 3))	//拆分字符串为切片	fmt.Println(strings.Split("222,33", ","))	//去掉头尾指定字符	fmt.Println(strings.Trim("a w w w a a", "a"))	//去掉首位空格放入切片	fmt.Println(strings.Fields("w 1 2 3 "))}