js代码如下：
const watch=()=>{
  const db = wx.cloud.database()
  const watcher = db.collection('goods')
  watcher.watch({
    onChange: function(snapshot) {
      console.log('docs\'s changed events', snapshot.docChanges)
      console.log('query result snapshot after the event', snapshot.docs)
      console.log('is init data', snapshot.type === 'init')
    },
    onError: function(err) {
      console.error('the watch closed because of error', err)
    }
  })
  //watcher.close()
}

j具体报错如下：