问试图在日期中替换从计算到计算的值

EN

<input id='from' />
<input id='to' />
<div class='calculated'></div>

var diff = 0;
jQuery('#from').datepicker({
    dateFormat: 'yy-mm-dd',
    changeMonth: true,
    changeYear: true,
});
jQuery('#to').datepicker({
    dateFormat: 'yy-mm-dd',
    changeMonth: true,
    changeYear: true,
});
jQuery('#from').datepicker().bind("change", function () {
    var minValue = jQuery(this).val();
    minValue = jQuery.datepicker.parseDate("yy-mm-dd", minValue);
    jQuery('#to').datepicker("option", "minDate", minValue);
    calculate();
});
jQuery('#to').datepicker().bind("change", function () {
    var maxValue = jQuery(this).val();
    maxValue = jQuery.datepicker.parseDate("yy-mm-dd", maxValue);
    jQuery('#from').datepicker("option", "maxDate", maxValue);
    calculate();
});

function calculate() {
    var d1 = jQuery('#from').datepicker('getDate');
    var d2 = jQuery('#to').datepicker('getDate');
    var oneDay = 24*60*60*1000;
    if (d1 && d2) {

      diff = Math.round(Math.abs((d2.getTime() - d1.getTime())/(oneDay)));
    }
    jQuery('.calculated').val(diff);
}