<input type=checkbox data-bind="checked:IsAll"/>全选

 <ul  data-bind="foreach: report">

            <li><input type="checkbox" name="re"  data-bind="value:key,checked:$parent.All" />

            <span data-bind="text: name"></span></li>

        </ul>

 viewModel = {  report: ko.observableArray([]),All: ko.observableArray([]), IsAll: ko.observable(false)};

 $(function () {

            ko.applyBindings(viewModel);

            viewModel.IsAll.subscribe(function () {

                if (!viewModel.IsAll()) { viewModel.All.removeAll(); }

                else {

                    viewModel.All.removeAll();

                    $.each(viewModel.Current(), function (i, j) {  viewModel.All.push(j); })

                }

            }, null, "change");

        })

viewModel.report.push({ key: SSO.key, name: SSO.value });