From 558037915399dd2a9221b628dbcf8fd0774bfbf9 Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@youzan.com>
Date: Wed, 7 Aug 2019 15:18:48 +0800
Subject: [PATCH] [bugfix] Stepper: should convert value type (#1838)

---
 packages/stepper/index.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/stepper/index.ts b/packages/stepper/index.ts
index 5c96b722..e2f7f0bd 100644
--- a/packages/stepper/index.ts
+++ b/packages/stepper/index.ts
@@ -86,14 +86,14 @@ VantComponent({
       this.triggerInput(value);
     },
 
-    onChange(type) {
+    onChange(type: string) {
       if (this.data[`${type}Disabled`]) {
         this.$emit('overlimit', type);
         return;
       }
 
       const diff = type === 'minus' ? -this.data.step : +this.data.step;
-      const value = Math.round((this.data.value + diff) * 100) / 100;
+      const value = Math.round((+this.data.value + diff) * 100) / 100;
       this.triggerInput(this.range(value));
       this.$emit(type);
     },