AngularJS 跨域

后台.NET WebApi AngularJS会有跨域问题，jquery 使$.post又正常

请求时添加headers:

app.controller("ppCtrl", function($scope, $http) {
	$scope.PostSchoolName = function() {
		var BaseUrl = "http://localhost:2996/api/school";
		var data = "{'schoolID':'3'}";
		$http({
				url: BaseUrl,
				method: 'post',
				headers: {
					'Content-Type': 'application/x-www-form-urlencoded'
				},
				data: data
			})
			.success(function(result) {
				alert(result);
			})
			.error(function(res) {
				alert("Error")
			})
	}
})