云函数调用startTransaction()引用数据库事务，安装"wx-server-sdk": "^1.7.0，云函数本地调试可以成功调用。

但上传并部署（所有文件）调用则报错，请问什么原因？

{“errorCode”:1,“errorMessage”:“user code exception caught”,“stackTrace”:“transaction is not defined\nReferenceError: transaction is not defined\n at EventHandler.exports.main [as realHandler] (/var/user/index.js:92:5)\n at \u003canonymous\u003e\n at process._tickCallback (internal/process/next_tick.js:188:7)”}