最近公司项目需要，利用vue实现pdf导出，从而保存到本地打印出来，说起来好像也很容易，具体要怎么实现呢？

1 、我们要添加两个模块

1 个.将页面html转换成图片
2 npm install --save html2canvas 
3 第二个.将图片生成pdf
4 npm install jspdf --save

2、定义全局函数..创建一个htmlToPdf.js文件在指定位置.我个人习惯放在(\'src/utils/htmlToPdf\')

 1 // 导出页面为PDF格式
 2 import html2Canvas from \'html2canvas\'
 3 import JsPDF from \'jspdf\'
 4 export default{
 5   install (Vue, options) {
 6     Vue.prototype.getPdf = function () {
 7       var title = this.htmlTitle
 8       html2Canvas(document.querySelector(\'#pdfDom\'), {
 9         allowTaint: true
10       }).then(function (canvas) {
11         let contentWidth = canvas.width
12         let contentHeight = canvas.height
13         let pageHeight = contentWidth / 592.28 * 841.89
14         let leftHeight = contentHeight
15         let position = 0
16         let imgWidth = 595.28
17         let imgHeight = 592.28 / contentWidth * contentHeight
18         let pageData = canvas.toDataURL(\'image/jpeg\', 1.0)
19         let PDF = new JsPDF(\'\', \'pt\', \'a4\')
20         if (leftHeight < pageHeight) {
21           PDF.addImage(pageData, \'JPEG\', 0, 0, imgWidth, imgHeight)
22         } else {
23           while (leftHeight > 0) {
24             PDF.addImage(pageData, \'JPEG\', 0, position, imgWidth, imgHeight)
25             leftHeight -= pageHeight
26             position -= 841.89
27             if (leftHeight > 0) {
28               PDF.addPage()
29             }
30           }
31         }
32         PDF.save(title + \'.pdf\')
33       }
34       )
35     }
36   }
37 }

3、在main.js中使用我们定义的函数文件。

1 import htmlToPdf from \'@/components/utils/htmlToPdf\'
2 Vue.use(htmlToPdf)

4、在需要的导出的页面..调用我们的getPdf方法即可.

1 <div class="row" id="pdfDom" style="padding-top: 55px;background-color:#fff;">
2     //给自己需要导出的ui部分.定义id为"pdfDom".此部分将就是pdf显示的部分
3 </div>
4 <button type="button" class="btn btn-primary"v-on:click="getPdf()">导出PDF</button>

1 export default {
2   data () {
3       return {
4       htmlTitle: \'页面导出PDF文件名\'
5       }
6   }
7  }

到这里大家会发现功能是可以实现了，但是会有个致命的问题，导出来的pdf打印出来还是比较模糊的，那么，针对这个问题，我们要怎么解决呢？

我们的思路是：将canvas的属性width和height属性放大为2倍，最后将canvas的css样式width和height设置为原来1倍的大小即可，也就是，先将canvas高分辨率输出，再来压缩导出打印，即可，废话不多说，完整代码如下：

 1 // 导出页面为PDF格式
 2 import html2Canvas from \'html2canvas\'
 3 import JsPDF from \'jspdf\'
 4 export default{
 5   install (Vue, options) {
 6     Vue.prototype.getPdf = function (dom,title) {
 7       var title = title
 8       var c = document.createElement("canvas")
 9       var opts = {
10         scale: 2, 
11         canvas: c, 
12         logging: true, 
13         width: document.querySelector(dom).width, 
14         height: document.querySelector(dom).height 
15       };
16       c.width = document.querySelector(dom).width * 2
17       c.height = document.querySelector(dom).height * 2
18       c.getContext("2d").scale(2, 2);
19       html2Canvas(document.querySelector(dom), opts).then(function (canvas) {
20         let contentWidth = canvas.width
21         let contentHeight = canvas.height
22         let pageHeight = contentWidth / 592.28 * 841.89
23         let leftHeight = contentHeight
24         let position = 0
25         let imgWidth = 595.28
26         let imgHeight = 592.28 / contentWidth * contentHeight
27         let pageData = canvas.toDataURL(\'image/jpeg\', 1.0)
28         let PDF = new JsPDF(\'\', \'pt\', \'a4\')
29         if (leftHeight < pageHeight) {
30           PDF.addImage(pageData, \'JPEG\', 0, 0, imgWidth, imgHeight)
31         } else {
32           while (leftHeight > 0) {
33             PDF.addImage(pageData, \'JPEG\', 0, position, imgWidth, imgHeight)
34             leftHeight -= pageHeight
35             position -= 841.89
36             if (leftHeight > 0) {
37               PDF.addPage()
38             }
39           }
40         }
41         PDF.save(title + \'.pdf\')
42       }
43       )
44     }
45   }
46 }