From e95107f14c967c4d76cdd6b5bdabee1861826f6b Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@buaa.edu.cn>
Date: Sun, 20 May 2018 20:40:33 +0800
Subject: [PATCH] [Improvement] optimize babel plugin (#1117)

---
 .babelrc                   | 26 +++++++++++++++++++++-----
 packages/stepper/index.vue |  2 +-
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/.babelrc b/.babelrc
index 7e23f6877..a6a59464a 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,14 +1,30 @@
 {
-  "presets": [["env", { "modules": false, "loose": true }]],
+  "presets": [
+    [
+      "env",
+      {
+        "modules": false,
+        "loose": true,
+        "exclude": ["transform-es2015-typeof-symbol"]
+      }
+    ]
+  ],
   "plugins": ["transform-runtime", "transform-object-rest-spread"],
   "env": {
     "commonjs": {
-      "presets": [["env", { "modules": "commonjs", "loose": true }]]
+      "presets": [
+        [
+          "env",
+          {
+            "modules": "commonjs",
+            "loose": true,
+            "exclude": ["transform-es2015-typeof-symbol"]
+          }
+        ]
+      ]
     },
     "test": {
-      "presets": [
-        ["env", { "targets": { "node": 8 }}]
-      ]
+      "presets": [["env", { "targets": { "node": 8 } }]]
     }
   }
 }
diff --git a/packages/stepper/index.vue b/packages/stepper/index.vue
index 7964527ff..4a2d43641 100644
--- a/packages/stepper/index.vue
+++ b/packages/stepper/index.vue
@@ -90,7 +90,7 @@ export default create({
 
   methods: {
     correctValue(value) {
-      return Number.isNaN(value)
+      return isNaN(value)
         ? this.min
         : Math.max(this.min, Math.min(this.max, value));
     },