javascript 把页面表格下载成excel

// 把页面的表格转化为excel下载下来
function tablesToExcel(table, name, filename) {

    var uri = "data:application/vnd.ms-excel;base64,"
        ,
        template = ""
        , body = ""
        , tablevar = "{table"
        , tablevarend = "}"
        , bodyend = ""
        , worksheet = ""
        , worksheetend = ""
        , worksheetvar = "{worksheet"
        , worksheetvarend = "}"
        , base64 = function (s) {
            return window.btoa(unescape(encodeURIComponent(s)));
        }
        , format = function (s, c) {
            return s.replace(/{(\w+)}/g, function (m, p) {
                return c[p];
            });
        }
        , wstemplate = ""
        , tabletemplate = "";

    var tables = table;

    for (var i = 0; i < tables.length; ++i) {
        wstemplate += worksheet + worksheetvar + i + worksheetvarend + worksheetend;
        /*
         *  addd  let two table arrange left and right
         */
        if (tables.length > 1) {
            tabletemplate += "" + tablevar + i + tablevarend + "";
        } else {
            tabletemplate += tablevar + i + tablevarend;
        }
    }

    /*
     * add  and  to Conbime left_tab and right_tab to one table
     */
    if (tables.length > 1) {
        tabletemplate = "" + tabletemplate + "";
    }

    var allTemplate = template + wstemplate + templateend;
    var allWorksheet = body + tabletemplate + bodyend;
    var allOfIt = allTemplate + allWorksheet;

    var ctx = {};
    for (var j = 0; j < tables.length; ++j) {
        ctx["worksheet" + j] = name[j];
    }

    for (var k = 0; k < tables.length; ++k) {
        var exceltable;
        if (!tables[k].nodeType) exceltable = document.getElementById(tables[k]);
        ctx["table" + k] = exceltable.innerHTML;
    }

    window.location.href = uri + base64(format(allOfIt, ctx));
}