Cannot read property '0' of undefined,Cannot read property 'map' of undefined,Cannot read property 'forEach' of undefined

[JakeWoki]

相关平台

H5

浏览器版本: Google Chrome 84.0.4147.105
使用框架: Vue 2

复现步骤

TypeError: Cannot read property '0' of undefined
    at addLeadingSlash (taro-tabbar.entry.js?a911:114)
    at new Tabbar (taro-tabbar.entry.js?a911:274)
    at eval (core-de9c9c2d.js?5c89:1592)
    at step (core-de9c9c2d.js?5c89:45)
    at Object.eval [as next] (core-de9c9c2d.js?5c89:26)
    at fulfilled (core-de9c9c2d.js?5c89:17)

TypeError: Cannot read property 'map' of undefined
    at Tabbar.render (taro-tabbar.entry.js?a911:344)
    at callRender (core-de9c9c2d.js?5c89:1289)
    at updateComponent (core-de9c9c2d.js?5c89:1253)
    at Array.update (core-de9c9c2d.js?5c89:1210)
    at consumeTimeout (core-de9c9c2d.js?5c89:161)
    at flush (core-de9c9c2d.js?5c89:184)

TypeError: Cannot read property 'forEach' of undefined
    at Tabbar.getSelectedIndex (taro-tabbar.entry.js?a911:143)
    at Tabbar.routerChangeHandler (taro-tabbar.entry.js?a911:191)
    at Tabbar.componentDidLoad (taro-tabbar.entry.js?a911:326)
    at safeCall (core-de9c9c2d.js?5c89:1369)
    at postUpdateComponent (core-de9c9c2d.js?5c89:1310)
    at postUpdate (core-de9c9c2d.js?5c89:1276)
    at updateComponent (core-de9c9c2d.js?5c89:1278)
    at Array.update (core-de9c9c2d.js?5c89:1210)
    at consumeTimeout (core-de9c9c2d.js?5c89:161)
    at flush (core-de9c9c2d.js?5c89:184)

期望结果

实际结果

环境信息

Taro v3.0.14


  Taro CLI 3.0.14 environment info:
    System:
      OS: Windows 7
    Binaries:
      Node: 12.18.4 - C:\Program Files\nodejs\node.EXE
      npm: 6.14.8 - C:\Program Files\nodejs\npm.CMD

3.0.10正常，之后几个版本都这样