记录日志很方便~

package main

import (
    "fmt"
    "log"
    "os"
)

func main() {
    fmt.Println("start")
    log.Println("start test log")
    fp,err := os.Create("test.log")
    if err != nil {
        log.Fatalln("create file faild")
        os.Exit(-1)
    }
    defer fp.Close()

    aLoger := log.New(fp,"",log.LstdFlags|log.Llongfile)
    log.Println("step1:")
    aLoger.Println("1 step log result")
    log.Println("step2:")
    //aLoger.SetFlags(log.LstdFlags)
    aLoger.Println("2 step log result")
    log.Println("step3:")
    aLoger.Fatalln("3 step log result")

}