[!] fix custom textStyle was overwritten by TEXT_FONTSIZE_STYLE_MAP
diff --git a/packages/wxc-button/index.vue b/packages/wxc-button/index.vue
index f9cb1db..94ca914 100644
--- a/packages/wxc-button/index.vue
+++ b/packages/wxc-button/index.vue
@@ -64,7 +64,7 @@
       },
       mrTextStyle () {
         const { type, disabled, textStyle, size } = this;
-        const mrTextStyle = { ...TEXT_STYLE_MAP[type], ...textStyle, ...TEXT_FONTSIZE_STYLE_MAP[size] };
+        const mrTextStyle = { ...TEXT_STYLE_MAP[type], ...TEXT_FONTSIZE_STYLE_MAP[size], ...textStyle };
         return disabled ? { ...mrTextStyle, color: '#FFFFFF' } : mrTextStyle;
       }
     },