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panic:运行时错误:切片范围超出范围

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我正在学习本教程:https://gobyexample.com/slices

我在中间:

package main

import "fmt"

func main() {

    s := make([]string, 3)
    fmt.Println("emp:", s)

    s[0] = "a"
    s[1] = "b"
    s[2] = "c"
    fmt.Println("set:", s)

    c := make([]string, len(s))
    copy(c, s)
    fmt.Println("copy:", c)

    l := s[2:5]
    fmt.Println("sl1:", l)
}

当我突然遇到这个错误时:

alex@alex-K43U:~/golang$ go run hello.go
emp: [  ]
set: [a b c]
copy: [a b c]
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
main.main()
    /home/alex/golang/hello.go:19 +0x2ba

goroutine 2 [syscall]:
created by runtime.main
    /usr/lib/go/src/pkg/runtime/proc.c:221
exit status 2

这是什么意思?教程错了吗?我该怎么办才能修复它?

2 回答

  • 3

    你忘记了_1456676_增长的部分 s .

    s = append(s, "d")
    s = append(s, "e", "f")
    fmt.Println("apd:", s)
    
  • 3

    您的代码省略了原始示例中的这些行:

    s = append(s, "d")
    s = append(s, "e", "f")
    

    没有这些行,len(s)== 3 .

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