/**
 * JSON转换Excel
 */
function parseExcel (fileDom) {
    let file = fileDom.files[0]
    let reader = new FileReader()
    let rABS = typeof FileReader !== "undefined" && (FileReader.prototype||{}).readAsBinaryString
    if (rABS) {
        reader.readAsBinaryString(file)
    } else {
        reader.readAsArrayBuffer(file)
    }
    reader.onload = function(e) {
        let data = e.target.result
        if (!rABS) {
            data = new Uint8Array(data)
        }
        let workBook = XLSX.read(data, {type: rABS ? 'binary' : 'array'})
        workBook.SheetNames.forEach(name => {
            let sheet = workBook.Sheets[name]
            let json = XLSX.utils.sheet_to_json(sheet, {
                raw: false,
                header: 1
            })
            // TODO 处理数据
        })
    }
}