fix(app): iOS Promise.then

packages/uni-app-vue/dist/service.runtime.esm.js

@@ -2315,7 +2315,7 @@ export default function vueFactory(exports) {
     }
 
   };
-  var isIOS = plus.os.name === 'iOS';
+  var isIOS = exports.platform === 'iOS';
   var resolvedPromise = isIOS ? iOSPromise : Promise.resolve();
   var currentFlushPromise = null;
   var currentPreFlushParentJob = null;

packages/uni-app-vue/lib/service.runtime.esm.js

@@ -1380,7 +1380,7 @@ const iOSPromise = {
         setTimeout(() => callback(), 0);
     }
 };
-const isIOS = plus.os.name === 'iOS';
+const isIOS = exports.platform === 'iOS';
 const resolvedPromise = isIOS ? iOSPromise : Promise.resolve();
 let currentFlushPromise = null;
 let currentPreFlushParentJob = null;