【1】介绍：

字符串就是一串固定长度的字符连接起来的字符序列。

【2】字符串的使用：

package main
import "fmt"

func main(){
        //1.定义一个字符串：
        var s1 string = "你好全面拥抱Golang"
        fmt.Println(s1)
        //2.字符串是不可变的：指的是字符串一旦定义好，其中的字符的值不能改变
        var s2 string = "abc"
        //s2 = "def"
        //s2[0] = 't'
        fmt.Println(s2)

        //3.字符串的表示形式：
        //（1）如果字符串中没有特殊字符，字符串的表示形式用双引号
        //var s3 string = "asdfasdfasdf"
        //（2）如果字符串中有特殊字符，字符串的表示形式用反引号 ``
        var s4 string = `
        package main
        import "fmt"

        func main(){
                //测试布尔类型的数值：
                var flag01 bool = true
                fmt.Println(flag01)

                var flag02 bool = false
                fmt.Println(flag02)

                var flag03 bool = 5 < 9
                fmt.Println(flag03)
        }
        `
        fmt.Println(s4)

        //4.字符串的拼接效果：
        var s5 string = "abc" + "def"
        s5 += "hijk"
        fmt.Println(s5)

        //当一个字符串过长的时候：注意：+保留在上一行的最后
        var s6 string = "abc" + "def" + "abc" + "def" + "abc" + "def" + "abc" +
         "def"+ "abc" + "def" + "abc" + "def"+ "abc" + "def" + "abc" + "def"+
          "abc" + "def" + "abc" + "def"+ "abc" + "def" + "abc" + "def"+ "abc" +
           "def" + "abc" + "def"+ "abc" + "def" + "abc" + "def"+ "abc" + "def" +
           "abc" + "def"+ "abc" + "def"
        fmt.Println(s6)

}