实现效果：

引入插件  npm install vue-print-nb --save

import Print from 'vue-print-nb'

Vue.use(Print) 

<div ref="printTest" id="printTest">
        <div style="text-align: center; page-break-after: always">
          <div style="font-size: 32px; text-align: center; width: 640px">
           记录报告单
          </div>
        </div>
      </div>
      <!-- v-print指令可以直接绑定到对应的打印区域-->
      <div style="margin-top: 10px">
        <el-button
          v-print="'#printTest'"
          type="primary"
          size="mini"
          style="margin-right: 10px"
          >打印</el-button
        >
        <el-button
          @click="ExportSavePdf(htmlTitle, nowTime)"
          type="primary"
          size="mini"
          >下载</el-button
        >
      </div>