uniapp使用livechat，h5可以调用，app端提示Cannot read property 'LiveChatWidget' of undefined

uniapp使用livechat，h5可以调用，app端提示Cannot read property 'LiveChatWidget' of undefined
[Vue warn]: Error in mounted hook: "TypeError: Cannot read property 'LiveChatWidget' of undefined"

found in

---> <LiveChatWidget>

• TypeError: Cannot read property 'LiveChatWidget' of undefined
  想用web-view加载页面，但是js好像加载失败