diff --git a/bin/core/core.a b/bin/core/core.a
index d075e89..ac8b058 100644
Binary files a/bin/core/core.a and b/bin/core/core.a differ
diff --git a/node/README.md b/node/README.md
index f39138c..337db37 100644
--- a/node/README.md
+++ b/node/README.md
@@ -143,11 +143,11 @@ MCU1 = new wiot.client({MAC: "xx:xx:xx:xx:xx:ww"});
 // 以下代码将实现: 当MCU0的D5接收到HIGH，MCU1的D4将会输出HIGH
 //                当MCU0的D5接收到LOW, MCU1的D4将会输出LOW
 // 本函数接受两个参数: 第一个是MCU对象数组, 第二个是参数为MCU对象数组的函数
-wiot.loop([MCU0, MCU1], (mcu) => {
-    if(mcu[1].read(wiot.D5) == wiot.HIGH){
-        mcu[0].write(wiot.D4, wiot.HIGH);
+wiot.loop([MCU0, MCU1], () => {
+    if(MCU1.read(wiot.D5) == wiot.HIGH){
+        MCU0.write(wiot.D4, wiot.HIGH);
     }else{
-        mcu[0].write(wiot.D4, wiot.LOW);
+        MCU0.write(wiot.D4, wiot.LOW);
     }
 });
 
diff --git a/node/app.js b/node/app.js
index 831c3b7..897fc1a 100644
--- a/node/app.js
+++ b/node/app.js
@@ -1,5 +1,5 @@
 var wiot = require('./wiot');
-MyMCU = new wiot.client({MAC: "3C:71:BF:3A:F6:CF", pin: {D4: wiot.OUTPUT},debug: 0});
+MyMCU = new wiot.client({MAC: "B4:E6:2D:6A:26:EE", pin: {D4: wiot.OUTPUT},debug: 0});
 //q = new wiot.client({MAC: "3C:71:BF:3A:F6:83", pin: {D3: 1} });
 wiot.begin([MyMCU], ()=>{ // 第一个参数为要等待的单片机对象数组，第二个参数为要执行的函数
     // 设置计时器，每隔2000毫秒, MyMCU的3号pin口将拉高一次电平
diff --git a/node/package.json b/node/package.json
index ac06872..fe8e475 100644
--- a/node/package.json
+++ b/node/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wiot",
-  "version": "0.0.12",
+  "version": "0.0.13",
   "description": "An awesome iot system for web developers~",
   "main": "wiot.js",
   "scripts": {
diff --git a/node/wiot.js b/node/wiot.js
index 0e71409..2d8739c 100644
--- a/node/wiot.js
+++ b/node/wiot.js
@@ -2,7 +2,7 @@
  * @Author: IoTcat (https://iotcat.me) 
  * @Date: 2019-05-04 18:59:49 
  * @Last Modified by: IoTcat
- * @Last Modified time: 2019-05-06 15:16:58
+ * @Last Modified time: 2019-05-06 22:05:07
  */
 var wiot_client = function (o_params) {
     var o = {
@@ -508,6 +508,7 @@ var wiot_client = function (o_params) {
     /* exc functions */
     var ini = function () {
         if (o.hint) console.log('wiot - ' + o.MAC + ': init...');
+        if(o.MAC.length != 17) throw "Wrong MAC Format!!!";
         getLocalIp();
         getMAC();
         //ip_scan();