增加pdf预览插件

package.json

@@ -29,6 +29,7 @@
     "path-to-regexp": "2.4.0",
     "vue": "2.6.14",
     "vue-easy-printer": "^1.0.6",
+    "vue-pdf": "^4.3.0",
     "vue-router": "3.4.9",
     "vue-to-pdf": "^1.0.0",
     "vuex": "3.1.0",