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@@ -1,36 +1,98 @@
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-import html2Canvas from 'html2canvas'
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-import JsPDF from 'jspdf'
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-
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-export default{
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- install (Vue, options) {
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- Vue.prototype.getPdf = function (title) {
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- html2Canvas(document.querySelector('#pdfDom'), {
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- allowTaint: true
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- }).then(function (canvas) {
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- let contentWidth = canvas.width
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- let contentHeight = canvas.height
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- let pageHeight = contentWidth / 592.28 * 841.89
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- let leftHeight = contentHeight
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- let position = 0
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- let imgWidth = 595.28
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- let imgHeight = 592.28 / contentWidth * contentHeight
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- let pageData = canvas.toDataURL('image/jpeg', 1.0)
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- let PDF = new JsPDF('', 'pt', 'a4')
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+import html2canvas from 'html2canvas';
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+import JsPDF from 'jspdf';
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+
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+/**
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+ * @param ele 要生成 pdf 的DOM元素（容器）
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+ * @param padfName PDF文件生成后的文件名字
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+ * */
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+
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+function downloadPDF(ele, pdfName){
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+
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+ let eleW = ele.offsetWidth;// 获得该容器的宽
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+ let eleH = ele.offsetHeight;// 获得该容器的高
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+
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+
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+ let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离
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+ let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离
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+
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+ var canvas = document.createElement("canvas");
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+ var abs = 0;
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+
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+ let win_in = document.documentElement.clientWidth || document.body.clientWidth; // 获得当前可视窗口的宽度（不包含滚动条）
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+ let win_out = window.innerWidth; // 获得当前窗口的宽度（包含滚动条）
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+
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+ if(win_out>win_in){
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+ // abs = (win_o - win_i)/2; // 获得滚动条长度的一半
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+ abs = (win_out - win_in)/2; // 获得滚动条宽度的一半
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+ // console.log(a, '新abs');
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+ }
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+
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+ canvas.width = eleW * 2; // 将画布宽&&高放大两倍
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+ canvas.height = eleH * 2;
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+
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+
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+
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+
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+ var context = canvas.getContext("2d");
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+
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+ context.scale(2, 2);
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+
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+ context.translate(-eleOffsetLeft -abs, -eleOffsetTop);
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+ // 这里默认横向没有滚动条的情况，因为offset.left(),有无滚动条的时候存在差值，因此
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+ // translate的时候，要把这个差值去掉
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+
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+ // html2canvas(element).then( (canvas)=>{ //报错
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+ // html2canvas(element[0]).then( (canvas)=>{
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+ html2canvas( ele, {
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+ dpi: 300,
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+ // allowTaint: true, //允许 canvas 污染， allowTaint参数要去掉，否则是无法通过toDataURL导出canvas数据的
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+ useCORS:true //允许canvas画布内 可以跨域请求外部链接图片, 允许跨域请求。
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+ } ).then( (canvas)=>{
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+
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+ var contentWidth = canvas.width;
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+ var contentHeight = canvas.height;
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+ //一页pdf显示html页面生成的canvas高度;
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+ var pageHeight = contentWidth / 592.28 * 841.89;
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+ //未生成pdf的html页面高度
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+ var leftHeight = contentHeight;
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+ //页面偏移
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+ var position = 0;
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+ //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
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+ var imgWidth = 595.28;
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+ var imgHeight = 595.28/contentWidth * contentHeight;
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+
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+ var pageData = canvas.toDataURL('image/jpeg', 1.0);
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+
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+
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+
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+ var pdf = new JsPDF('', 'pt', 'a4');
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+
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+ //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
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+ //当内容未超过pdf一页显示的范围，无需分页
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if (leftHeight < pageHeight) {
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- PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
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- } else {
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- while (leftHeight > 0) {
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- PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
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- leftHeight -= pageHeight
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- position -= 841.89
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- if (leftHeight > 0) {
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- PDF.addPage()
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+ //在pdf.addImage(pageData, 'JPEG', 左，上，宽度，高度)设置在pdf中显示；
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+ pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
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+ // pdf.addImage(pageData, 'JPEG', 20, 40, imgWidth, imgHeight);
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+ } else { // 分页
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+ while(leftHeight > 0) {
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+ pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
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+ leftHeight -= pageHeight;
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+ position -= 841.89;
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+ //避免添加空白页
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+ if(leftHeight > 0) {
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+ pdf.addPage();
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+ }
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}
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- }
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}
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- PDF.save(title + '.pdf')
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- }
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- )
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- }
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- }
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+
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+ //可动态生成
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+ pdf.save(pdfName);
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+ })
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+
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+
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}
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+
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+
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+export default {
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+ downloadPDF
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+}
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九山