$http设置headers来实现IE不缓存url请求的资源

var getOrders = function(){
    var deferred = $q.defer();
    $http({
    method:'get',
    url:'/getOrders',
    headers: {'Cache-Control':'no-cache;max-age=0', 'Pragma': 'no-cache'}
}).then(function(response) {
    deferred.resolve(response.data);
}, function(err) {
    deferred.reject(err);
});
    return deferred.promise;
};