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>