diff --git a/src/core/view/components/button/index.vue b/src/core/view/components/button/index.vue
index f6b9e4ab43c441d425ca98f36b6aa081d65a007e..a3c6754dfb734d488c5078bfc13f68b0e7b382c9 100644
--- a/src/core/view/components/button/index.vue
+++ b/src/core/view/components/button/index.vue
@@ -81,7 +81,7 @@ export default {
         feedback.show('slide-in-right')
         feedback.getTitleNView &&
           setTimeout(function () {
-            let title = feedback.getTitleNView()
+            const title = feedback.getTitleNView()
             if (title) {
               title.drawText(
                 '发送',
@@ -107,9 +107,9 @@ export default {
     },
     _bindObjectListeners (data, value) {
       if (value) {
-        for (let key in value) {
-          let existing = data.on[key]
-          let ours = value[key]
+        for (const key in value) {
+          const existing = data.on[key]
+          const ours = value[key]
           data.on[key] = existing ? [].concat(existing, ours) : ours
         }
       }
@@ -117,7 +117,7 @@ export default {
     }
   },
   render (createElement) {
-    let $listeners = Object.create(null)
+    const $listeners = Object.create(null)
     if (this.$listeners) {
       Object.keys(this.$listeners).forEach(e => {
         if (this.disabled && (e === 'click' || e === 'tap')) {