h5版本pdf预览，使用pdfjs

1、安装

npm install pdfjs-dist@2.0.943 --save

2、编写PDFJSUtil.js工具类

/**
 * pdfjs
 */
import PDFJS from 'pdfjs-dist'
// owrker
import workerSrc from 'pdfjs-dist/build/pdf.worker'
// 设置work
// PDFJS.workerSrc = workerSrc;
PDFJS.GlobalWorkerOptions.workerSrc = workerSrc
//
let PDFJSUtil = {
    // 加载pdf
    async loadPdf({el, url, scale = 1.5}){
        // dom对象
        let pdfCol = $Fw.getEl(el);
        // 创建pdf对象
        let pdf = await PDFJS.getDocument(url);
        // 获取分页
        let pages = pdf.numPages;
        // 循环添加
        for (let i = 1; i <= pages; i++) {
            let canvas = document.createElement('canvas')
            let page = await pdf.getPage(i)
            let viewport = page.getViewport(scale)
            let context = canvas.getContext('2d')
            canvas.height = viewport.height
            canvas.width = viewport.width
            let renderContext = {
                canvasContext: context,
                viewport: viewport
            }
            await page.render(renderContext)
            canvas.className = 'canvas'
            pdfCol.appendChild(canvas)
        }
    }
}
// 输出
export default PDFJSUtil;

demo.vue

<template>
 <div id="pdfid"></div>
</template>
<script>
import PDFJSUtil from './pdfjs/index.js'

export default {
  data(){
    return {}
  },
  /**
   * 挂在dom
   */
  mounted(){
    // 加载pdfjs
    PDFJSUtil.loadPdf({
      // dom位置
      el: '#pdfid', 
      // pdf地址
      url: 'http://127.0.0.1:8099/test.pdf',
      // 缩放比 默认1.5
      // scale: 1.5
    });
  }
}
</script>
<style>
 #pdfid {
        height: 100vh;
        width: 100%;
        overflow: hidden;
}
</style>