是否可以检测是否从Web应用程序安装了Microsoft Excel

function checkExcelInstalled() {
  var excelInstalled = false;
  var mimeTypes = navigator.mimeTypes;
  for (var i = 0; i < mimeTypes.length; i++) {
    if (mimeTypes[i].type == "application/vnd.ms-excel") {
      excelInstalled = true;
      break;
    }
  }
  return excelInstalled;
}

function checkExcelInstalled() {
  var excelInstalled = false;
  try {
    var excel = new ActiveXObject("Excel.Application");
    excelInstalled = true;
  } catch (e) {
    excelInstalled = false;
  }
  return excelInstalled;
}