Promise使用

new Promise((resolve, reject) => {
   this.$refs.echarts.$refs[childRef].time=Object.assign(
     this.$refs.echarts.$refs[childRef].time, {'statDate': this.statDate,'type':this.type})
   this.$refs.echarts.$refs[childRef].queryDataReq(resolve)
}).then((data) => {
   this.$refs.echarts.$refs[childRef].exportBefore()
})

queryDataReq (callback) {
    queryAllStat(this.queryUrl, this.time).then(res => {
        if (res.data.code == 0) {
          callback && callback()
          this.restore(res.data.data)
        } else {
          this.restore()
        }
        this.setLastUpdateTime()
        this.updateView()
      }).catch(() => {
        this.restore()
        this.updateView()
      })
}