Golang中未定义的地图元素

Question

由于某种原因，我收到以下错误

./execTest.go:24: template.datacenter undefined (type map[string]string has no field or method datacenter)

./execTest.go:25: template.datacenter undefined (type map[string]string has no field or method datacenter)

这是我的 Go 代码

package main

import (

    "fmt"

)

var template map[string]string

func main() {

    template := map[string]string{

        "cluster":    "",

        "datacenter": "The_Datacenter",

        "host":       "",

        "password":   "",

        "username":   "",

        "vm_name":    "",

    }

    args := []string{

        "--acceptAllEulas",

        "--compress=9",

    }

    if template.datacenter != "" {

        args = append(args, fmt.Sprintf("--datacenter=%s", template.datacenter))

    }

    fmt.Println(template)

}