<!DOCTYPE html><html><head><meta charset="utf-8"><script src="//apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script></head><body><div ng-app="myApp" ng-controller="myCtrl"><p>{{ x1 }}</p><p>{{ x2 }}</p></div><script>var app = angular.module('myApp', []);app.controller('myCtrl', function($scope) {$scope.x1 = "JOHN";$scope.x2 = angular.isNumber($scope.x1);});</script></body></html>