diff --git a/packages/vue-cli-plugin-uni/lib/format-log.js b/packages/vue-cli-plugin-uni/lib/format-log.js
index 0f57cb04e46c4f142df04ee0ce066dbbd975268b..711c0af385a889ad430b66a14cc6e0d5c7a01e0b 100644
--- a/packages/vue-cli-plugin-uni/lib/format-log.js
+++ b/packages/vue-cli-plugin-uni/lib/format-log.js
@@ -1,11 +1,16 @@
 function typof (v) {
-  const s = Object.prototype.toString.call(v)
+  var s = Object.prototype.toString.call(v)
   return s.substring(8, s.length - 1)
 }
 
-export default function formatLog (...args) {
-  const msgs = args.map((v) => {
-    const type = Object.prototype.toString.call(v)
+export default function formatLog () {
+  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+    args[_key] = arguments[_key]
+  }
+
+  var msgs = args.map(function (v) {
+    var type = Object.prototype.toString.call(v)
+
     if (type.toLowerCase() === '[object object]') {
       try {
         v = '---BEGIN:JSON---' + JSON.stringify(v) + '---END:JSON---'
@@ -18,7 +23,8 @@ export default function formatLog (...args) {
       } else if (v === undefined) {
         v = '---UNDEFINED---'
       } else {
-        const vType = typof(v).toUpperCase()
+        var vType = typof(v).toUpperCase()
+
         if (vType === 'NUMBER' || vType === 'BOOLEAN') {
           v = '---BEGIN:' + vType + '---' + v + '---END:' + vType + '---'
         } else {
@@ -26,12 +32,15 @@ export default function formatLog (...args) {
         }
       }
     }
+
     return v
   })
-  let msg = ''
+  var msg = ''
+
   if (msgs.length > 1) {
-    const lastMsg = msgs.pop()
+    var lastMsg = msgs.pop()
     msg = msgs.join('---COMMA---')
+
     if (lastMsg.indexOf(' at ') === 0) {
       msg += lastMsg
     } else {
@@ -40,5 +49,6 @@ export default function formatLog (...args) {
   } else {
     msg = msgs[0]
   }
+
   return msg
 }