Contains
func Contains(s, substr string) bool
功能：字符串s中是否包含substr，返回bool值
示例代码：
fmt.Println(strings.Contains("seafood", "foo"))
fmt.Println(strings.Contains("seafood", "bar"))
fmt.Println(strings.Contains("seafood", ""))
fmt.Println(strings.Contains("", ""))
//运行结果:
//true
//false
//true
//true
Join
func Join(a []string, sep string) string
功能：字符串链接，把slice a通过sep链接起来
示例代码：
s := []string{"foo", "bar", "baz"}
fmt.Println(strings.Join(s, ", "))
//运行结果:foo, bar, baz
Index
func Index(s, sep string) int
功能：在字符串s中查找sep所在的位置，返回位置值，找不到返回-1
示例代码：
fmt.Println(strings.Index("chicken", "ken"))
fmt.Println(strings.Index("chicken", "dmr"))
//运行结果:
// 4
// -1
Repeat
func Repeat(s string, count int) string
功能：重复s字符串count次，最后返回重复的字符串
示例代码：
fmt.Println("ba" + strings.Repeat("na", 2))
//运行结果:banana
Replace
func Replace(s, old, new string, n int) string
功能：在s字符串中，把old字符串替换为new字符串，n表示替换的次数，小于0表示全部替换
示例代码：
fmt.Println(strings.Replace("oink oink oink", "k", "ky", 2))
fmt.Println(strings.Replace("oink oink oink", "oink", "moo", -1))
//运行结果:
//oinky oinky oink
//moo moo moo
Split
func Split(s, sep string) []string
功能：把s字符串按照sep分割，返回slice
示例代码：
fmt.Printf("%q\n", strings.Split("a,b,c", ","))
fmt.Printf("%q\n", strings.Split("a man a plan a canal panama", "a "))
fmt.Printf("%q\n", strings.Split(" xyz ", ""))
fmt.Printf("%q\n", strings.Split("", "Bernardo O'Higgins"))
//运行结果:
//["a" "b" "c"]
//["" "man " "plan " "canal panama"]
//[" " "x" "y" "z" " "]
//[""]
Trim
func Trim(s string, cutset string) string
功能：在s字符串的头部和尾部去除cutset指定的字符串
示例代码：
fmt.Printf("[%q]", strings.Trim(" !!! Achtung !!! ", "! "))
//运行结果:["Achtung"]
Fields
func Fields(s string) []string
功能：去除s字符串的空格符，并且按照空格分割返回slice
示例代码：
fmt.Printf("Fields are: %q", strings.Fields(" foo bar baz "))
//运行结果:Fields are: ["foo" "bar" "baz"]
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