async onShareTimeline() {
    const carsLength=await this.submitCars()
    console.log("carsLength====>",carsLength);
    const title='换台车 · '+carsLength+'台精品车源邀您品鉴'
    return {
      title:title,
      query: {
        locationId: this.data.location.id,
        locationName: this.data.location.name
      }
    }
  },

为啥这个自定义的标题没有生效