<script type="text/javascript" src="js/html2canvas.js"></script>
<script type="text/javascript" src="js/html2canvas.min.js"></script>
<script type="text/javascript" src="js/jspdf.debug.js"></script>

 <div id="down_pdf">導(dǎo)出為PDF按鈕</div>
 <div class="sta-main">需要獲取為PDF的div</div>

<script type="text/javascript">
/* var downPdf = document.getElementById("down_pdf"); */
var downPdf = document.getElementById("down_pdf");
$("#down_pdf").on("click", function() {
 var canvas2 = document.createElement("canvas");
 let _canvas = document.querySelector('.sta-main');
 //獲取寬高
 var w = parseInt(window.getComputedStyle(_canvas).width);
 var h = parseInt(window.getComputedStyle(_canvas) .height);
 //將canvas畫(huà)布放大2倍，然后盛放在小的容器內(nèi)，處理模糊
 canvas2.width = w * 2;
 canvas2.height = h * 2;
 canvas2.style.width = w + "px";
 canvas2.style.height = h + "px";
 var context = canvas2.getContext("2d");
 //處理偏移
 context.scale(1.5, 1.5);
 //修改背景顏色，默認(rèn)是黑色
 $('.sta-main').css("background", "#fff")
 html2canvas( _canvas, {
 //處理pdf跨域獲取不到跨域信息問(wèn)題
 taintTest : false,
 useCORS : true,
 allowTaint : false, 
 canvas : canvas2,
 dpi: 172,//導(dǎo)出pdf清晰度
 onrendered: function (canvas) {
 var contentWidth = canvas.width;
 var contentHeight = canvas.height;
 //一頁(yè)pdf顯示html頁(yè)面生成的canvas高度;
 var pageHeight = contentWidth / 592.28 * 841.89;
 //未生成pdf的html頁(yè)面高度
 var leftHeight = contentHeight;
 //pdf頁(yè)面偏移
 var position = 0;
 //html頁(yè)面生成的canvas在pdf中圖片的寬高（a4紙的尺寸[595.28,841.89]）
 var imgWidth = 595.28;
 var imgHeight = 592.28 / contentWidth * contentHeight;
 var pageData = canvas.toDataURL('image/jpeg', 1.0);
 var pdf = new jsPDF('', 'pt', 'a4');
 //有兩個(gè)高度需要區(qū)分，一個(gè)是html頁(yè)面的實(shí)際高度，和生成pdf的頁(yè)面高度(841.89)
 //當(dāng)內(nèi)容未超過(guò)pdf一頁(yè)顯示的范圍，無(wú)需分頁(yè)
 if (leftHeight < pageHeight) {
 pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
 } else {
 while (leftHeight > 0) {
 pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
 leftHeight -= pageHeight;
 position -= 841.89;
 //避免添加空白頁(yè)
 if (leftHeight > 0) {
 pdf.addPage();
 }
 }
 }
 pdf.save('PDF的名字.pdf');
 }
 })
 $('.sta-main').css("background", "")
})
</script>