Bootstrap Datetime Picker输出自动返回日期

Question

I'm using bootstrap-datetimepicker

我在下面有一个工作代码，请帮我修复下面的第二个脚本，我试图做的是一旦你在拾取日期时间选择器中选择任何日期并选择选择字段上的持续时间它将自动填满返回日期基于您从持续时间选择和开始日期中选择的持续时间

第一个代码js代码:(它的工作原理，因为默认日期是我们当前的日期）

$(document).ready(function() {

$('#datetimepicker8').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date(), defaultDate : Date.now() });
$('#datetimepicker9').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date()});

$('select[name = sas]').on('change', function() {

    var futureDate = new Date(Date.now());
    futureDate.setMonth(futureDate.getMonth() + parseInt(this.value));
    $('#datetimepicker9').data("DateTimePicker").date(futureDate);

});
})

第二个JS代码不起作用

$(document).ready(function() {

    $('#datetimepicker8').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date()});
    $('#datetimepicker9').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date()});

    $('select[name = sas]').on('change', function() {

        //start date
        $('#datetimepicker8').data("DateTimePicker").date(Date.now());

        //future date
        var futureDate = new Date(Date.now());
        futureDate.setMonth(futureDate.getMonth() + parseInt(this.value));
        $('#datetimepicker9').data("DateTimePicker").date(futureDate);

    });

})

HTML

<select name="sas">
      <option disabled selected value required>Duration: 1-36 Months</option>
      <option value="1">1 Month</option>
      <option value="2">2 Months</option>
      <option value="3">3 Months</option>
      <option value="4">4 Months</option>
      <option value="5">5 Months</option>
      <option value="6">6 Months</option>
      <option value="7">7 Months</option>
      <option value="8">8 Months</option>
      <option value="9">9 Months</option>
      <option value="10">10 Months</option>
      <option value="11">11 Months</option>
      <option value="12">12 Months</option>
      <option value="13">13 Months</option>
      <option value="14">14 Months</option>
      <option value="15">15 Months</option>
      <option value="16">16 Months</option>
      <option value="17">17 Months</option>
      <option value="18">18 Months</option>
      <option value="19">19 Months</option>
      <option value="20">20 Months</option>
      <option value="21">21 Months</option>
      <option value="22">22 Months</option>
      <option value="23">23 Months</option>
      <option value="24">24 Months</option>
      <option value="25">25 Months</option>
      <option value="26">26 Months</option>
      <option value="27">27 Months</option>
      <option value="28">28 Months</option>
      <option value="29">29 Months</option>
      <option value="30">30 Months</option>
      <option value="31">31 Months</option>
      <option value="32">32 Months</option>
      <option value="33">33 Months</option>
      <option value="34">34 Months</option>
      <option value="35">35 Months</option>
      <option value="36">36 Months</option>
</select>

Answer 1

$（document）.ready（function（）{

$('#datetimepicker8').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date() }); 
$('#datetimepicker9').datetimepicker({ sideBySide: true, toolbarPlacement: "bottom", showClose: true, stepping: 30, minDate: new Date()});                                    

$('select[name = sas]').on('change', function() {

    //start date
   var objs = $('#datetimepicker8').data('DateTimePicker').date()


    //future date

     var futureDate = new Date(objs);
    futureDate.setMonth(futureDate.getMonth() + parseInt(this.value));
    $('#datetimepicker9').data("DateTimePicker").date(futureDate);

});                        

})