云函数调用失败？请大神帮忙解决，谢谢
VM473:1 Uncaught (in promise) thirdScriptError errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID b07cf7a0-9957-11ea-8093-525400f41496, cloud function service error code -504002, error message ReferenceError: wx is not defined at Object.<anonymous> (/var/user/index.js:4:12) at Module._compile (internal/modules/cjs/loader.js:701:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10) at Module.load (internal/modules/cjs/loader.js:600:32) at tryModuleLoad (internal/modules/cjs/loader.js:539:12) at Function.Module._load (internal/modules/cjs/loader.js:531:3) at Module.require (internal/modules/cjs/loader.js:637:17) at require (internal/modules/cjs/helpers.js:22:18) at Object.module.exports.load (/var/runtime/node10/UserFunction.js:22:19) at Runtime.handleOnce (/var/runtime/node10/Runtime.engine.js:84:38); at cloud.callFunction api; Error: errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID b07cf7a0-9957-11ea-8093-525400f41496, cloud function service error code -504002, error message ReferenceError: wx is not defined
