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为什么 main 中调用包中可导出变量提示未

 1 year ago
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为什么 main 中调用包中可导出变量提示未

fmt_return · 大约5小时之前 · 34 次点击 · 预计阅读时间 1 分钟 · 大约8小时之前 开始浏览    

被导入包：

package utils

import (
    "github.com/elastic/go-elasticsearch/v6"
    "log"
)

var EsClient *elasticsearch.Client

func init() {
    host := Cfg.Section("es").Key("host").String()
    if host == "" {
        log.Fatal("es Host 未设置")
    }

    cfg := elasticsearch.Config{
        Addresses: []string{host},
    }

    EsClient, err := elasticsearch.NewClient(cfg)
    if err != nil {
        log.Fatal("连接失败", err)
    }

    _, err = EsClient.Info()
    if err != nil {
        log.Fatalf("连接出错："+host, err)
    }

    fmt.Println(EsClient) // &{0xc000166000 0xc000162000}
}

main.go

package main

import (
    "data_push/utils"
    "fmt"
)

func main() {
   fmt.Println(utils.EsClient) // 结果为 nil
}

main 函数中输出 utils 包中 EsClient 变量，结果为 nil，但是 utils 包中初始化后值不为 nil，这是什么原因呢？

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