vue2 pdf 预览（可粘贴，超链接可点），创建文本层和批注层_vue2 封装一个批注功能

        vue2的项目，其中使用"pdfjs-dist的2的版本；

        页面引入：

const PDFJS = require('pdfjs-dist')
PDFJS.GlobalWorkerOptions.workerSrc = require('pdfjs-dist/build/pdf.worker.min')
import { TextLayerBuilder,AnnotationLayerBuilder, SimpleLinkService } from 'pdfjs-dist/web/pdf_viewer'
import 'pdfjs-dist/web/pdf_viewer.css'

 <div class="wrapper" id="pdf-container">
                  <div v-for="item in totals" :id="`page-${item}`" :key="item" class="pdf-box">
                    <canvas :id="`canvas-${item}`" class="canvas-pdf"></canvas>
                  </div>
                </div>

// 接口获取数据
xxxapi().then(res=>{
         var binaryData = [];
          binaryData.push(res.data);
          console.log(binaryData);
          // 记得一定要设置application的类型
          let url = window.URL.createObjectURL(
            new Blob(binaryData, {
              type: "application/pdf;charset=utf-8",
            })
          );
          if (url) {
            this.contentSpining=false
            this.showPdf = true;
            let source = { url: url };
            PDFJS.getDocument(source).then(pdf => {
            // 得到PDF的总的页数
            let totalPage = pdf.numPages
            let idName = 'canvas-pdf-'
            // 根据总的页数创建相同数量的canvas
            this.createCanvas(totalPage, idName)
            for (let i = 1; i <= totalPage; i++) {
              pdf.getPage(i).then((page) => {
                let pageDiv = document.getElementById(`page-${i}`)
               
                let viewport = page.getViewport(this.scale)
                let canvas = document.getElementById(idName + i)
                let context = canvas.getContext('2d')
               
                canvas.height = viewport.height
                canvas.width = viewport.width
                this.viewHeight = viewport.height
                let renderContext = {
                  canvasContext: context,
                  viewport
                }
              
                page.render(renderContext).then(() => {
                  return page.getTextContent()
                }).then((textContent) => {
                  // 创建文本图层div
                  const textLayerDiv = document.createElement('div')
                  textLayerDiv.setAttribute('class', 'textLayer')
 
                
                  // 将文本图层div添加至每页pdf的div中
                  pageDiv.appendChild(textLayerDiv)
                  let textLayer = new TextLayerBuilder({
                    textLayerDiv: textLayerDiv,
                    pageIndex: page.pageIndex,
                    viewport: viewport
                  })
                  textLayer.setTextContent(textContent)
                  textLayer.render()
                })
 
                // 批注层
               
                page.getAnnotations().then(annotations=>{
                  // const annoLayerDiv=document.createElement(`div`)
                  // annoLayerDiv.setAttribute('class', 'annotationLayer')
 
                    const annolayer = new AnnotationLayerBuilder({
                    pageDiv: pageDiv,
                    annotations: annotations,
                    pdfPage: page,
                    linkService: new SimpleLinkService(),
                  });
                  annolayer.render(viewport);
                })
             
 
              })
            }
          })
 
 
})