样式必须以less方式引入

package.json

@@ -14,14 +14,16 @@
     "@babel/runtime": "^7.2.0",
     "@nuxtjs/axios": "^5.3.6",
     "awe-dnd": "^0.3.4",
+    "iview-loader": "^1.3.0",
     "better-scroll": "^1.12.1",
     "dayjs": "^1.8.22",
     "js-cookie": "^2.2.1",
-    "less": "^2.7.3",
-    "less-loader": "^4.1.0",
+    "less": "^3.10.3",
+    "ua-parser-js": "^0.7.18",
+    "less-loader": "^5.0.0",
     "lodash": "^4.17.15",
     "lowdb": "^1.0.0",
-    "nuxt": "^2.0.0",
+    "nuxt": "^2.10.2",
     "screenfull": "^5.0.2",
     "view-design": "^4.1.3",
     "iview-pro": "file:./iview-pro",

styles/index.less

 @import "./default/index.less";
-@import "./font/iconfont.css";
+@import "./font/iconfont.less";
 @import "./setting.less";
 @import "./common.less";