[update] pdf预览增加一个随机数参数

src/utils/previewPdf.js

@@ -5,7 +5,10 @@ const getToken = () => Vue.ls.get(ACCESS_TOKEN)
 
 // 预览pdf
 const previewPdf = (id) => {
-  const url = `${window._CONFIG.domianURL}/sys/common/view/${id}?type=view&at=${getToken()}`
+  const uidGenerator = () => {
+    return '-' + parseInt(Math.random() * 10000 + 1, 10)
+  }
+  const url = `${window._CONFIG.domianURL}/sys/common/view/${id}?type=view&at=${getToken()}&serial=${uidGenerator()}`
   return `${process.env.BASE_URL}pdfjs/web/viewer.html?file=` + encodeURIComponent(url) + '&.pdf'
 }