diff --git a/server.js b/server.js
index 648d43d..3453976 100644
--- a/server.js
+++ b/server.js
@@ -1,49 +1,45 @@
+/**
+ * Sense HAT 服务端
+ */
+
 require('dotenv').config()  // 读取系统环境变量
 
-// HTTP 请求路由
+// HTTP状态测试路由
 const app = require('express')()
 app.get('/', (req, res) => res.sendStatus(200))
 
-// 服务器启动
+// 启动HTTP服务
 const port = process.env.PORT || 3000
-const host = process.env.HOST || 'localhost'
 const server = app.listen(port, host, () => {
-    console.log(`rpi sense hat server is running at http://${host}:${port}`)
+    console.log(`rpi sense hat server is running on port ${port}`)
 })
 
-// Sense HAT 全局数据 及 初始化
-const R = [255, 0, 0]
-const G = [0, 255, 0]
-const B = [0, 0, 255]
-const Y = [255, 255, 0]
-const P = [255, 0, 255]
-const C = [0, 255, 255]
-const O = [255, 255, 255]
-const _ = [0, 0, 0]
+// Sense HAT 初始化
 const sensehat = {
     led: {
-        ...require('sense-hat-led').sync,
         /*
-            sleep(n) 暂停 n 秒
-            clear()  清除所有
-            clear(rgb) or clear([r,g,b])  填充颜色
-            setPixel(x,y,r,g,b) or setPixel(x,y,rgb)  设置一个点
-            getPixel(x,y) 返回 [r,g,b]  获取一个点
-            setPixels([[r,g,b]*64])
-            getPixels() -> [[r,g,b]*64]
-            flipH(redraw=true)  水平反转
-            flipV(redraw=true)  垂直反转
-            getter and setter rotation 默认为 0
-            setRotation(r, redraw=true)  设置旋转，r 初始为 0，r 只能设置为 0/90/180/270
-            loadImage(filePath, redraw=true)
-            showLetter(character, textColour=[255,255,255], backColour=[0,0,0])
-            showMessage(textString, scrollSpeed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
-            flashMessage(textString, speed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
+            require('sense-hat-led').sync中包含以下方法：
+                sleep(n) 暂停 n 秒
+                clear()  清除所有
+                clear(rgb) or clear([r,g,b])  填充颜色
+                setPixel(x,y,r,g,b) or setPixel(x,y,rgb)  设置一个点
+                getPixel(x,y) 返回 [r,g,b]  获取一个点
+                setPixels([[r,g,b]*64])
+                getPixels() -> [[r,g,b]*64]
+                flipH(redraw=true)  水平反转
+                flipV(redraw=true)  垂直反转
+                getter and setter rotation 默认为 0
+                setRotation(r, redraw=true)  设置旋转，r 初始为 0，r 只能设置为 0/90/180/270
+                loadImage(filePath, redraw=true)
+                showLetter(character, textColour=[255,255,255], backColour=[0,0,0])
+                showMessage(textString, scrollSpeed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
+                flashMessage(textString, speed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
 
-            # 未实现 # getter and setter lowLight 默认为 true
-            # 未实现 # getter and setter gamma = Array of length 32 containing Integers between 0 and 31
-            # 未实现 # gammaReset()  恢复默认 gamma
+                # 未实现 # getter and setter lowLight 默认为 true
+                # 未实现 # getter and setter gamma = Array of length 32 containing Integers between 0 and 31
+                # 未实现 # gammaReset()  恢复默认 gamma
         */
+        ...require('sense-hat-led').sync,
         get pixels() { return sensehat.led.getPixels() },
     },
 }
@@ -54,17 +50,39 @@ sensehat.led.loadImage('images/heart.png')
 // socketio 服务
 const io = require('socket.io')(server, { cors: { origin: '*' } })
 io.on('connection', (client) => {
+
+    // 初始化客户端led矩阵
     io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
-    client.on('action', ({ action, x, y, color, pixels, delay, image, character, speed, background, text }) => {
-        x = Number(x), y = Number(y), delay = Number(delay) | 200, speed = Number(speed) | 0.2
-        if (character == undefined) character = ' '
-        if (background == undefined) background = [0, 0, 0]
+
+    // 处理客户端请求
+    client.on('action', ({ action, color, x, y, pixels, image, character, delay, speed, background, text }) => {
+
+        x = Number(x)
+        y = Number(y)
+        delay = Number(delay || 200)
+        speed = Number(speed || 0.1)
+        character = character || ' '
+        background = background || [0, 0, 0]
+
         switch (action) {
+
             case 'clear':
-                if (color == undefined) color = [0, 0, 0]
+                color = color || [0, 0, 0]
                 sensehat.led.clear(color)
                 io.emit('action', { action: 'clear', color })
                 break
+
+            case 'setPixel':
+                if (color == undefined) color = [255, 255, 255]
+                sensehat.led.setPixel(x, y, color)
+                io.emit('action', { action: 'setPixel', x, y, color })
+                break
+
+            case 'getPixel':
+                color = sensehat.led.getPixel(x, y)
+                client.emit('action', { action: 'setPixel', x, y, color })
+                break
+
             case 'flash':
                 if (color == undefined) color = [255, 255, 255]
                 sensehat.led.clear(color)
@@ -74,15 +92,7 @@ io.on('connection', (client) => {
                     io.emit('action', { action: 'clear' })
                 }, delay)
                 break
-            case 'setPixel':
-                if (color == undefined) color = [255, 255, 255]
-                sensehat.led.setPixel(x, y, color)
-                io.emit('action', { action: 'setPixel', x, y, color })
-                break
-            case 'getPixel':
-                color = sensehat.led.getPixel(x, y)
-                client.emit('action', { action: 'setPixel', x, y, color })
-                break
+
             case 'setPixels':
                 for (let i = 0; i < pixels.length; i++) {
                     var color = pixels[i]
@@ -92,29 +102,35 @@ io.on('connection', (client) => {
                 }
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'getPixels':
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'flipH':
                 sensehat.led.flipH()
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'flipV':
                 sensehat.led.flipV()
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'turnLeft':
                 var heading_angle = (Number(sensehat.led.rotation) + 90) % 360
                 sensehat.led.rotation = heading_angle
                 sensehat.led.setRotation(heading_angle)
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'turnRight':
                 var heading_angle = (Number(sensehat.led.rotation) + 360 - 90) % 360
                 sensehat.led.rotation = heading_angle
                 sensehat.led.setRotation(heading_angle)
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'loadImage':
                 try {
                     sensehat.led.loadImage(`images/${image}.png`)
@@ -128,18 +144,21 @@ io.on('connection', (client) => {
                 sensehat.led.showLetter(character, color, background)
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'showMessage':
                 if (color == undefined) color = [255, 255, 255]
                 sensehat.led.showMessage(text, speed, color, background)
                 sensehat.led.clear()
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             case 'flashMessage':
                 if (color == undefined) color = [255, 255, 255]
                 sensehat.led.flashMessage(text, speed, color, background)
                 sensehat.led.clear()
                 io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
                 break
+
             default:
                 break
         }