pdf.js 展示 PDF 文件完整指南：跨平台兼容与跨域处理

	judgeClient() {
      let client = ''
      if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) { // 判断iPhone|iPad|iPod|iOS
        client = 'iOS'
      } else if (/(Android)/i.test(navigator.userAgent)) { // 判断Android
        client = 'Android'
      } else {
        client = 'PC'
      }
      return client
    }

file后携带需要展示的pdf链接
<iframe src="pdfjs/web/viewer.html?file=http://xxxx/file/xxxx.pdf" width="500" height="500"></iframe>

	<iframe
          v-if="item.url && item.url.split('.').pop().toLowerCase() === 'pdf' && client !== 'iOS'"
          :src="'pdfjs/new/web/viewer.html?file=' + item.url"
          allow="fullscreen"
          align="center"
          name="ifd"
          width="100%"
          scrolling="no"
          frameborder="0"
          type="application/pdf"
          height="700"/>
        <iframe
          v-else-if="item.url && item.url.split('.').pop().toLowerCase() === 'pdf' && client === 'iOS'"
          :src="'pdfjs/old/web/viewer.html?file=' + item.url"
          allow="fullscreen"
          align="center"
          name="ifd"
          width="100%"
          scrolling="no"
          frameborder="0"
          type="application/pdf"
          height="700"/>