HTML导出PDF有边框 使用jspdf导出的pdf的页面边框

使用jspdf函数下载pdf文件时,我需要获取页面边框.

我该如何实现.我能够单独为表格设置边框,而不能为页面设置边框.

var doc = new jsPDF('p', 'pt');

doc.setFontSize(12);

doc.setTextColor(0);

doc.setFontStyle('bold');

doc.text('Col and row span', 40, 50);

var elem = document.getElementById("table1");

var elem1 = document.getElementById("tbl1");

var elem1 = document.getElementById("example");

var res = doc.autoTableHtmlToJson(elem);

var res1 = doc.autoTableHtmlToJson(elem1);

doc.text('Theme "plain"', 40, doc.autoTableEndPosY() + 30);

doc.autoTable(res.columns, res.data, {

startY: 90,

theme: 'grid',

drawHeaderRow: function(cell, data) {

return false;

},

pageBreak: 'avoid',

margin: {

right: 305

}

});

doc.autoTable(res.columns, res.data, {

startY: 90,

pageBreak: 'avoid',

theme: 'grid',

drawHeaderRow: function(cell, data) {

return false;

},

margin: {

left: 305

}

});

doc.autoTable(res1.columns, res1.data, {

startY: doc.autoTableEndPosY() + 30,

});

如何为该文档设置边框？