_this is not defined;at api operateWXData success callback function ReferenceError: _this is not defined at success (app-service.js:10233:414124) at Object.o.<computed> (WASubContext.js:2:1195803) at Function.<anonymous> (WASubContext.js:2:447494) at y (WASubContext.js:2:399405) at v (WASubContext.js:2:399643) at at (WASubContext.js:2:401197)