Merge pull request #535 from Tencent/fix/checkbox/external-class

fix(checkbox): enable external class

Author: LeeJim

src/checkbox/checkbox.ts

@@ -40,7 +40,7 @@ export default class CheckBox extends SuperComponent {
 
   options: ComponentsOptionsType = {
     multipleSlots: true,
-    styleIsolation: 'shared',
+    // styleIsolation: 'shared',
   };
 
   properties = {