update

MyForm/login.gtpl

@@ -6,7 +6,8 @@
         <form action="/login" method="post">
             用户名:<input type="text" name="username">
             密码:<input type="password" name="password">
-            <input type="submit" value="登陆">
+            年龄:<input type="text" name="age">
+            <input type="submit" value="提交">
         </form>
     </body>
 </html>

MyForm/main.go

@@ -41,8 +41,20 @@ func login(w http.ResponseWriter, r *http.Request) {
 		}
 	} else {
 		//请求的是登陆数据，那么执行登陆的逻辑判断
-		fmt.Println("username:", r.Form["username"])
-		fmt.Println("password:", r.Form["password"])
+		fmt.Println("username:", r.Form["username"][0])
+		fmt.Println("password:", r.Form["password"][0])
+		fmt.Println("age:", r.Form["age"][0])
+		if len(r.Form["username"][0]) == 0 {
+			//为空的处理
+			fmt.Println("username is empty!!!")
+		}
+		getint, err := strconv.Atoi()(r.Form.Get("age"))
+		if err != nil {
+			fmt.Println("this is an error")
+		}
+		if getint > 100 {
+			fmt.Println("too old")
+		}
 	}
 }