在选择日期时，带有Eonasdan datepicker的Knockout bindingHandler不会触发dp.change事件

ko.bindingHandlers.datepicker = {
    init: function(element, valueAccessor, allBindingsAccessor) {
        var options = allBindingsAccessor().datepickerOptions || {};
        $(element).datepicker(options);
        
        // 监听日期选择变化事件
        $(element).on('dp.change', function() {
            var observable = valueAccessor();
            observable($(element).datepicker("getDate"));
        });
    },
    update: function(element, valueAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor());
        $(element).datepicker("setDate", value);
    }
};

<input type="text" data-bind="datepicker: myDate">