点餐小程序（后端）

server/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>KOA</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>com.aptana.ide.core.unifiedBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.aptana.projects.webnature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>0</id>
+			<name></name>
+			<type>26</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-node_modules</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

server/app.js

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+var current_path = process.cwd();
+console.log(current_path);
+require('runkoa')(__dirname + '/entry.js')

server/config/WXBizDataCrypt.js

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+var crypto = require('crypto')
+
+function WXBizDataCrypt(appId, sessionKey) {
+  this.appId = appId
+  this.sessionKey = sessionKey
+}
+
+WXBizDataCrypt.prototype.decryptData = function (encryptedData, iv) {
+  // base64 decode
+  var sessionKey = new Buffer(this.sessionKey, 'base64')
+  encryptedData = new Buffer(encryptedData, 'base64')
+  iv = new Buffer(iv, 'base64')
+
+  try {
+     // 解密
+    var decipher = crypto.createDecipheriv('aes-128-cbc', sessionKey, iv)
+    // 设置自动 padding 为 true，删除填充补位
+    decipher.setAutoPadding(true)
+    var decoded = decipher.update(encryptedData, 'binary', 'utf8')
+    decoded += decipher.final('utf8')
+
+    decoded = JSON.parse(decoded)
+
+  } catch (err) {
+    throw new Error('Illegal Buffer')
+  }
+
+  if (decoded.watermark.appid !== this.appId) {
+    throw new Error('Illegal Buffer')
+  }
+
+  return decoded
+}
+
+module.exports = WXBizDataCrypt

server/config/wxConfig.js

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+/* 微信参数AppID 和 Secret */
+var wxConfig = {
+    AppID: "YOUR_APPID",  // 小程序ID
+    Secret: "YOUR_APP_SERCRET",  // 小程序Secret
+    Mch_id: "YOUR_MCH_ID", // 商户号
+    Mch_key: "YOUR_MCH_KEY", // 商户key
+    // 生成商户订单号
+    getWxPayOrdrID: function(){
+        var myDate = new Date();
+        var year = myDate.getFullYear();
+        var mouth = myDate.getMonth() + 1;
+        var day = myDate.getDate();
+        var hour = myDate.getHours();
+        var minute = myDate.getMinutes();
+        var second = myDate.getSeconds();
+        var msecond = myDate.getMilliseconds(); //获取当前毫秒数(0-999)
+        if(mouth < 10){ /*月份小于10  就在前面加个0*/
+            mouth = String(String(0) + String(mouth));
+        }
+        if(day < 10){ /*日期小于10  就在前面加个0*/
+            day = String(String(0) + String(day));
+        }
+        if(hour < 10){ /*时小于10  就在前面加个0*/
+            hour = String(String(0) + String(hour));
+        }
+        if(minute < 10){ /*分小于10  就在前面加个0*/
+            minute = String(String(0) + String(minute));
+        }
+        if(second < 10){ /*秒小于10  就在前面加个0*/
+            second = String(String(0) + String(second));
+        }
+        if (msecond < 10) {
+            msecond = String(String('00') + String(second));
+        } else if(msecond >= 10 && msecond < 100){
+            msecond = String(String(0) + String(second));
+        }
+
+        var currentDate = String(year) + String(mouth) + String(day) + String(hour) + String(minute) + String(second) + String(msecond);
+        return currentDate;
+    }
+};
+module.exports = wxConfig;