前端table导出excel

function putOutExcel() {
    let table = document.getElementById('tableExcel_Day');
    var fileName =new Date().Format("yyyyMMddhhmmss");
    let sheet = XLSX.utils.table_to_sheet(table);//将一个table对象转换成一个sheet对象
    sheet['!cols']=[{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100},{wpx: 100}];
    openDownloadDialog(sheet2blob(sheet), fileName+'.xlsx');
}
//导出Excel
// 将一个sheet转成最终的excel文件的blob对象，然后利用URL.createObjectURL下载
function sheet2blob(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;
    }
    return blob;
}
function openDownloadDialog(url, saveName) {
    if (typeof url == 'object' && url instanceof Blob) {
        url = URL.createObjectURL(url); // 创建blob地址
    }
    var aLink = document.createElement('a');
    aLink.href = url;
    aLink.download = saveName || ''; // 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);
}