package main

import (
    "bytes"
    "fmt"
    "reflect"
    "strings"
)

func main() {

    sentence := []byte("The Go language has built-in facilities, as well as library support, for writing concurrent programs.")
    fmt.Printf("%q\n", sentence)

    vowelsSpace := " "
    chop := bytes.FieldsFunc(sentence, func(r rune) bool {
        return strings.ContainsRune(vowelsSpace, r)
    })

    for index, element := range chop {
        fmt.Printf("\n%d => %q", index, element)
    }
    fmt.Println("\n", "chop type : ", reflect.ValueOf(chop).Kind())

    vowelsSpace = ","
    chop = bytes.FieldsFunc(sentence, func(r rune) bool {
        return strings.ContainsRune(vowelsSpace, r)
    })

    for index, element := range chop {
        fmt.Printf("\n%d => %q", index, element)
    }
    fmt.Println("\n", "chop type : ", reflect.ValueOf(chop).Kind())
}

编译输出:

C:/Go/bin/go.exe build -i [D:/golang/src/JsonTest]
成功: 进程退出代码 0.
D:/golang/src/JsonTest/JsonTest.exe  [D:/golang/src/JsonTest]
"The Go language has built-in facilities, as well as library support, for writing concurrent programs."

0 => "The"
1 => "Go"
2 => "language"
3 => "has"
4 => "built-in"
5 => "facilities,"
6 => "as"
7 => "well"
8 => "as"
9 => "library"
10 => "support,"
11 => "for"
12 => "writing"
13 => "concurrent"
14 => "programs."
 chop type :  slice

0 => "The Go language has built-in facilities"
1 => " as well as library support"
2 => " for writing concurrent programs."
 chop type :  slice
成功: 进程退出代码 0.