[improvement] check event.cancelable before preventDefault

packages/number-keyboard/Key.js

@@ -1,4 +1,5 @@
 import { use } from '../utils';
+import { preventDefault } from '../utils/event';
 
 const [sfc, bem] = use('key');
 
@@ -29,8 +30,7 @@ export default sfc({
     },
 
     onBlur(event) {
-      event.preventDefault();
-      event.stopPropagation();
+      preventDefault(event, true);
       this.active = false;
     }
   },

packages/number-keyboard/index.js

@@ -1,5 +1,5 @@
 import { use } from '../utils';
-import { stop } from '../utils/event';
+import { stopPropagation } from '../utils/event';
 import Key from './Key';
 
 const [sfc, bem, t] = use('number-keyboard');
@@ -145,7 +145,7 @@ export default sfc({
           vShow={this.show}
           style={{ zIndex: this.zIndex }}
           class={bem([theme, { 'safe-area-inset-bottom': this.safeAreaInsetBottom }])}
-          onTouchstart={stop}
+          onTouchstart={stopPropagation}
           onAnimationend={this.onAnimationEnd}
           onWebkitAnimationEnd={this.onAnimationEnd}
         >