push 就地操作数组.简单

$scope.order = [];
$scope.itemDetails = function() {
    // Here data get after form submiti have array arrieve from form submit.
    $scope.order.push({name:$scope.item.name,price:$scope.item.price});
}

(不分配)，这应该可以工作！

(without assigning it), and that should work!