问导出HTML表到excel，在使用office打开文件时发出警告

EN

var file = new Blob([ html.outerHTML], {
            type: "application/vnd.ms-excel"
        });
        var url = URL.createObjectURL(file);
        var filename = dateSelected + "-" + "attendance" + ".xls"

        //here we are creating HTML <a> Tag which can be trigger to download the excel file.
        var a = document.createElement('a');
        a.id = "export";
        document.body.appendChild(a);
        //here we are checking if the bwoswer is IE or not if IE then we use window.navigator.msSaveBlob function otherwise Go with Simple Blob file.
        if (window.navigator && window.navigator.msSaveBlob) {
            window.navigator.msSaveBlob(file, filename);
            a.click();
            document.body.removeChild(a);
            document.body.removeChild(html);
        } else {
            a.download = filename;
            a.href = url;
            a.click();
            document.body.removeChild(a);
            document.body.removeChild(html);
        }