Angular中保存了很多的判断方法，可以用来验证对象是否符合某种要求，详细的参考代码样例即可
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script> </head> <body ng-app="myApp"> <div ng-controller="myCtrl" id="test"> {{ isArray }} <br><br> {{ isDate }} <br><br> {{ isUnDefined }} <br> {{ isDefined }} <br><br> {{ DocumentisElement }} <br> {{ DivisElement }} <br><br> {{ isFunction }} <br><br><br> {{ isNumber1 }} <br> {{ isNumber2 }} <br> {{ isNumber3 }} <br> {{ isNumber4 }} <br><br> {{ isObject1 }} <br> {{ isObject2 }} <br> {{ isObject3 }} <br> {{ isObject4 }} <br><br> {{ isString1 }} <br> {{ isString2 }} <br> {{ isString3 }} <br> {{ isString4 }} <br><br> </div> <script type="text/javascript"> var app = angular.module("myApp",[]); app.controller("myCtrl",function($scope){ var arr = ["1","2","3"]; $scope.isArray = angular.isArray(arr);//true var date = new Date(); $scope.isDate = angular.isDate(date);//true var UnDefined; $scope.isUnDefined = angular.isUndefined(UnDefined);//true var Defined = ""; $scope.isDefined = angular.isDefined(Defined);//true $scope.DocumentisElement = angular.isElement(document);//true $scope.DivisElement = angular.isElement(document.getElementById("test"));//true $scope.isFunction = angular.isFunction(function(){});//true $scope.isNumber1 = angular.isNumber(4);//true $scope.isNumber2 = angular.isNumber(4.3);//true $scope.isNumber3 = angular.isNumber(10/0);//true $scope.isNumber4 = angular.isNumber(null);//false $scope.isObject1 = angular.isObject(null);//false $scope.isObject2 = angular.isObject(undefined);//false $scope.isObject3 = angular.isObject(function(){});//false $scope.isObject4 = angular.isObject(date);//true $scope.isString1 = angular.isString("value");//true $scope.isString2 = angular.isString(‘fds‘);//true $scope.isString3 = angular.isString(null);//false $scope.isString4 = angular.isString(4);//false }); </script> </body> </html>
原文：http://www.cnblogs.com/feng18/p/5139879.html