开发工具基础很少出现这个问题

发布后经常出现这个问题，不知道到底怎么回事，后台接口没有问题。

有时候页面也正常。

MiniProgramError

Can't find variable: res

ReferenceError: Can't find variable: res

at fail (appservice.app.js:3121:2791)

at  (WASubContext.js:1:139883)

at i (WASubContext.js:1:140156)

at  (WAServiceMainContext.js:1:922989)

at <api request fail callback function>

at $c (WAServiceMainContext.js:1:652132)

at  (WAServiceMainContext.js:1:827738)

at <NetworkRequest360fail callback function>

at vf (WAServiceMainContext.js:1:748168)

at forEach (native code)

at emit (WAServiceMainContext.js:1:748809)

at c (WAServiceMainContext.js:1:828779)

at XS (WAServiceMainContext.js:1:830126)

at  (WAServiceMainContext.js:1:830742)

at  (WAServiceMainContext.js:1:626827)

at  (WAServiceMainContext.js:1:617343)

at emit (WAServiceMainContext.js:1:118955)

at emit (native code)

at emit (WAServiceMainContext.js:1:118574)

at subscribeHandler (WAServiceMainContext.js:1:122098)