id 可以打印出来 为什么最后成空了呢？

onLoad: function (options) {
    // this.getData(options)
    this.getLocation()
    const id = options.id
    console.log(id)
    markers_db.doc(id).get().then(res => {
      console.log(res.data)

报错：    
MiniProgramError
errCode: -1  | errMsg: collection.doc:fail docId must not be empty; at collection.doc api; 
Error: errCode: -1  | errMsg: collection.doc:fail docId must not be empty; at collection.doc api;