Knockout自定义绑定my97datepicker

/*             my97datepicker  时间格式'yyyy-MM-dd HH-mm-ss'           */
       ko.bindingHandlers.datetimes = {
           init: function (element, valueAccessor, viewModel) {
               var value = ko.utils.unwrapObservable(valueAccessor());
               $(element).attr("class", "Wdate");
               $(element).focus(function () {
                   WdatePicker({
                       isShowClear: false, readOnly: true, dateFmt: 'yyyy-MM-dd HH:mm:ss'
                   });
               });
               $(element).val(value);
           },
           update: function (element, valueAccessor, viewModel) {
               var value = ko.utils.unwrapObservable(valueAccessor());
               $(element).val(value);
               $(element).blur(function () {
                   var v = $(element).val();
                   valueAccessor()(v);
               });
           }
       };

<input id="date_times" data-bind="datetimes:forms.dates" data-options="required:true" style=" 150px;" />