vue-pdf realizes online file preview

<template>
 <div class="pdf-box">
 //pdf display<pdf
          class="pdf"
          :page="pageNum"
          :src="pdfForm.url"
          @progress="loadedRatio = $event"
          @num-pages="pageTotalNum = $event"
        ></pdf>
        //Page number switching <div class="page-box">
          <el-button-group>
            <el-button
              type="primary"
              icon="el-icon-arrow-left"
              size="mini"
              @click="prePage"
              >Previous page</el-button
            >
            <el-button type="primary" size="mini" @click="nextPage"
              >Next page<i class="el-icon-arrow-right el-icon--right"></i
            ></el-button>
          </el-button-group>
          //Page number display <div style=" color: #409EFF; display: flex; justify-content: flex-end;">
            {{ pageNum }} / {{ pageTotalNum }}
          </div>
        </div>
      </div>
</template>

<script>
import pdf from 'vue-pdf'
export default {
  name: 'pdf',
  components: { pdf },
  data () {
   pdfForm: { url: '' },
      // View pdf
      url:'',
      pageNum: 1,
      pageTotalNum: 1, // Total number of pages loadedRatio: 0 // Loading progress of the current page, the range is 0-1, when it is equal to 1, it means that the current page has been fully loaded},
  method:{
 //Previous page prePage () {
      let page = this.pageNum
      page = page > 1 ? page - 1 : this.pageTotalNum
      this.pageNum = page
    },

    // Next page nextPage () {
      let page = this.pageNum
      page = page < this.pageTotalNum ? page + 1 : 1
      this.pageNum = page
    },
  }
 }
</script>