退步青年

/**
 *
 * @param {Object} sheet 表格数据
 * @param {String} sheetName 文件名
 */
export function downloadExcel(sheet, sheetName) {
  sheetName = sheetName || 'sheet1'
  var workbook = {
    SheetNames: [sheetName],
    Sheets: {},
  }
  workbook.Sheets[sheetName] = sheet
  // 生成excel的配置项
  var wopts = {
    bookType: 'xlsx', // 要生成的文件类型
    bookSST: false, // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
    type: 'binary',
  }
  var wbout = XLSX.write(workbook, wopts)
  var blob = new Blob([s2ab(wbout)], { type: 'application/octet-stream' })
  // 字符串转ArrayBuffer
  function s2ab(s) {
    var buf = new ArrayBuffer(s.length)
    var view = new Uint8Array(buf)
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xff
    return buf
  }

  let url = URL.createObjectURL(blob)

  var aLink = document.createElement('a')
  aLink.href = url
  aLink.download = (sheetName || '') + '.xlsx' // HTML5新增的属性，指定保存文件名，可以不要后缀，注意，file:///模式下不会生效
  var event
  if (window.MouseEvent) event = new MouseEvent('click')
  else {
    event = document.createEvent('MouseEvents')
    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
  }
  aLink.dispatchEvent(event)
}