Page({
onShow: function () {
this.getTabBar().setData({selectedIndex:0});
}
})
看上面的代码，我刚才试了一下，结果出现了Cannot read property 'setData' of null的错误（如下图），有没有更好的解决方法解决这个错误？
相关问题
相关文档
- FileSystemManager.read: 小程序/开发/API/文件/FileSystemManager/FileSystemManager.read
- 合理使用 setData: 小程序/开发/指南/性能与体验/运行时性能/合理使用 setData
- 1. setData 的流程: 小程序/开发/指南/性能与体验/运行时性能/合理使用 setData
- FileSystemManager.read#参数: 小程序/开发/API/文件/FileSystemManager/FileSystemManager.read
- FileSystemManager.read#错误: 小程序/开发/API/文件/FileSystemManager/FileSystemManager.read
if (typeof this.getTabBar === 'function' ) { this.getTabBar((tabBar) => { tabBar.setData({ selected: 0 }) }) }页面【pages/index/index]错误:
TypeError: Cannot read property 'getTabBar' of undefined
at index.js? [sm]:2
at WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1
at p.runWith (WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1)
at q (WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1)
at <anonymous>:8:5
at evaluateRes (index.js:1)
at index.js:1
at Object.invoke (index.js:1)
at r (index.js:1)
at Object.invoke (WAServiceMainContext.js?t=wechat&s=1706507854346&v=3.3.3:1)(env: Windows,mp,1.06.2401020; lib: 3.3.3)
TypeError: Cannot read property 'getTabBar' of undefined
at index.js? [sm]:2
at WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1
at p.runWith (WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1)
at q (WASubContext.js?t=wechat&s=1706507854346&v=3.3.3:1)
at <anonymous>:8:5
at evaluateRes (index.js:1)
at index.js:1
at Object.invoke (index.js:1)
at r (index.js:1)
at Object.invoke (WAServiceMainContext.js?t=wechat&s=1706507854346&v=3.3.3:1)(env: Windows,mp,1.06.2401020; lib: 3.3.3)
<!--custom-tab-bar/index.wxml--><view class="tab"><view class="item" bindtap="switchPage" data-index="0"><text class="iconfont icon-shouye icon {{selectedIndex == 0 ? 'sclected' : '' }}"></text><text class="title {{selectedIndex == 0 ? 'sclected' : '' }}">首页</text></view><view class="item" bindtap="switchPage" data-index="1"><text class="iconfont icon-shangpinfenlei icon {{selectedIndex == 1 ? 'sclected' : '' }}"></text><text class="title {{selectedIndex == 1 ? 'sclected' : '' }}">商品分类</text></view><view class="item" bindtap="switchPage" data-index="2"><text class="iconfont icon-gouwuche icon {{selectedIndex == 2 ? 'sclected' : '' }}"></text><text class="title {{selectedIndex == 2 ? 'sclected' : '' }}">购物车</text></view><view class="item" bindtap="switchPage" data-index="3"><text class="iconfont icon-wo icon {{selectedIndex == 3 ? 'sclected' : '' }}"></text><text class="title {{selectedIndex == 3 ? 'sclected' : '' }}">我</text></view></view>