定义的切片不被识别为执行类型

Question

我尝试在线进行一些教程，但是当我声明的对象切片无法实例化时出现麻烦

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "net/http"
)

// Article type
type Article struct {
    Title   string `json:"title"`
    Desc    string `json:"desc"`
    Content string `json:"content"`
}

// Articles is array that holds Article type
// var Articles []Article
var Articles []Article

func allArticles(w http.ResponseWriter, r *http.Request) {
    var articles = Articles{
        Article{Title: "Test 1", Desc: "Desc", Content: "Content"},
        Article{Title: "Test 2", Desc: "Desc 2", Content: "Content 2"},
    }

    fmt.Println("Endpoint hit: returnAllArticle")
    json.NewEncoder(w).Encode(articles)
}
func homePage(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Welcome to the HomePage")
    fmt.Println("Endpoint hit: homePage")
}

func handleRequest() {
    http.HandleFunc("/", homePage)
    http.HandleFunc("/articles", allArticles)
    log.Fatal(http.ListenAndServe(":8888", nil))
}

func main() {
    handleRequest()
}

它总是在第22行说错误

var articles = Articles{

有错误消息

Articles is not a type of go

如果我不做声明，就像

var articles = []Article{ ....

很好，但是我想使用全局变量