Merge pull request astaxie#1160 from RRCAT920/update-zh-04.4.md

Update zh/04.4.md

Author: astaxie

zh/04.4.md

@@ -21,10 +21,10 @@
 func login(w http.ResponseWriter, r *http.Request) {
 fmt.Println("method:", r.Method) //获取请求的方法
 if r.Method == "GET" {
-crutime := time.Now().Unix()
-h := md5.New()
-io.WriteString(h, strconv.FormatInt(crutime, 10))
-token := fmt.Sprintf("%x", h.Sum(nil))
+timestamp := strconv.Itoa(time.Now().Nanosecond())
+hashWr := md5.New()
+hashWr.Write([]byte(timestamp))
+token := fmt.Sprintf("%x", hashWr.Sum(nil))
 
 t, _ := template.ParseFiles("login.gtpl")
 t.Execute(w, token)