Knockout.js 使用RequireJS和KnockoutJS公开ViewModel

如果我有一个作为对象（“viewModel”）一部分的函数，我如何通过requirejs公开它

<a href="#" class="btn btn-primary" data-bind="click: function() { viewModel.addFlight(id) } ">Add Flight</a>

试试下面的方法

define(function () {
    var viewModel = {
       this.flights = ko.observableArray([]),
       this.addFlight = function (id) {
       }
    }

  return viewModel;
});

define(function () {
    var viewModel = {
       this.flights = ko.observableArray([]),
       this.addFlight = function (id) {
       }
    }

  return viewModel;
});