一、PDF

1、安装html2canvas和jspdf

npm install --save html2canvas
npm install --save jspdf

2、创建生成PDF的js文件

import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default{
  install (Vue, options) {
    //id:根据id作为生成PDF的内容，title:生成文件的名称，调用时直接使用getPdf方法名调用
    Vue.prototype.getPdf = function (id,name) { 
      html2Canvas(document.querySelector(`#${id}`), {
        // allowTaint: true
        useCORS:true//看情况选用上面还是下面的，
      }).then(function (canvas) {
            let contentWidth = canvas.width
            let contentHeight = canvas.height
            let pageHeight = contentWidth / 592.28 * 841.89
            let leftHeight = contentHeight
            let position = 0
            let imgWidth = 595.28
            let imgHeight = 592.28 / contentWidth * contentHeight
            let pageData = canvas.toDataURL('image/jpeg', 1.0)
            let PDF = new JsPDF('', 'pt', 'a4')
            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
                  if (leftHeight > 0) {
                      PDF.addPage()
                  }
              }
            }
            PDF.save(name + '.pdf')
        }
      )
    }
  }
}

3、在main.js里引入该js文件

//'/utils/htmlToPdf'是我的文件路径
import htmlToPdf from '@/utils/htmlToPdf'
Vue.use(htmlToPdf)

4、调用

无需在使用页面引入js文件，直接调用方法名即可

this.getPdf('id',name)

二、图片

1、安装html2canvas(和上述一样)

2、创建生成图片的js文件

import html2canvas from 'html2canvas';

//下载页面为图片格式
export default {
  install (Vue, options) {
    Vue.prototype.downPageToImage = function (id, name) {
      //var scrollHeight = $('#contentDiv').prop("scrollHeight");
      //$('#contentDiv').scrollTop(scrollHeight);
      //var height = $('#contentDiv').height();
      html2canvas(document.querySelector(`#${id}`),{
        //height: scrollHeight,
        //y: height-(scrollHeight+20)
      }).then(canvas => {
        /**
         * 获取mimeType
         * @param  {String} type the old mime-type
         * @return the new mime-type
         */
        var type = 'jpeg';
        var imgData=canvas.toDataURL(type);
  
        var _fixType = function(type) {
          type = type.toLowerCase().replace(/jpg/i, 'jpeg');
          var r = type.match(/png|jpeg|bmp|gif/)[0];
          return 'image/' + r;
        };
        // 加工image data，替换mime type
        imgData = imgData.replace(_fixType(type),'image/octet-stream');
        /**
         * 在本地进行文件保存
         * @param  {String} data     要保存到本地的图片数据
         * @param  {String} filename 文件名
         */
        var saveFile = function(data, filename){
          var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
          save_link.href = data;
          save_link.download = filename;
          var event = document.createEvent('MouseEvents');
          event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
          save_link.dispatchEvent(event);
        };
        // 下载后的文件名
        var filename = '图片' + (new Date()).getTime() + '.' + type;
        // download
        saveFile(imgData,filename);
      })
    }
  }
}

3、在main.js里引入该js文件

Vue.use(htmlToPdf)
import downToImage from './util/download/img/downToImage'

4、调用

与上述一样，无需在使用页面引入js文件，直接调用方法名即可

this.downPageToImage('id',name)