knockout.js model 更改后为什么view没刷新？

[zhangwei139559]

 <script type="text/javascript">


        function ViewModel(options) {
            var sss = [{ id: '11',name:'name1' }, { id: '22',name:'name2'}]
            var self = this;
            self.sbs = ko.observableArray({
                id: ko.observable(),
                name: ko.observable()
            };);
            self.replacedata = function (data) {
                for (var i = 0; i < self.sbs().length; i++) {
                    var existing = self.sbs()[i];
                    if (existing.id == data.id) {
                        self.sbs.replace(existing, data);

                    }
                }

            }
        }



        Object.prototype.clone = function () {
            var obj = {};

            for (var p in this)

                obj[p] = this[p];

            return obj;

        };
        $(function () {
            $("#Button1").click(function () {

                $.each(viewModel.sbs(), function (n, value) {
                    existing = value;
                    if (value.id == '11') {
                        value.name = "1212";
                        viewModel.sbs.replace(existing, value);
                        //return false;
                    }
                });
            });

            ko.applyBindings(viewModel);
        });

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <input id="Button1" type="button" value="button" />
    <table>
        <thead>
            <tr>
                <th>
                </th>
                <th>
                    检查项目
                </th>
                <th>
                    检查结果
                </th>
                <th>
                    判定
                </th>
            </tr>
        </thead>
        <tbody data-bind='foreach: sbs'>
            <tr>
                <td>
                    <input type="text" data-bind="value: name" />
                </td>
            </tr>
        </tbody>
    </table>

    </form>
</body>
<ml>

sbs中id=11的name变化了，为什么页面没刷新？？？

[zhangwei139559]

顶啊