methods: {
    fetchSourceData(callback) {
        return new Promise((resolve, reject) => {
            resolve(this.sourceData = this.$refs.ht.hotInstance.getSourceData())
        })
    },
    cutExcelData() {
        this.fetchSourceData()
        .then(res => {
            console.log(res)
         })
        .catch(err => {
            console.log(err)
        })
    }
}