问html2pdf:如果此选项的值为0，则不显示选择选项的文本

EN

jQuery(document).ready(function($) {

    function PDF1(){
        
            var element = document.getElementById('content');
            
            var opt = {
                
                margin: 0.5,                
                filename:     'myfile.pdf',
                
                image:        { type: 'jpeg', quality: 0.98 },
                html2canvas:  { 
                    scale: 2,
                    
                },
                jsPDF:        { unit: 'in', format: 'A4', orientation: 'portrait' }
            };
            
            // Old monolithic-style usage:
            html2pdf(element, opt);
        } 

          
          $('#genpdf').click(function () {
              PDF1();
          })

});

<select id="select4" name="select4" class="text col12" >

<option value="0">&nbsp;</option>

<option value="5">Yes</option>

<option value="0">No</option>

</select>

<div class="columns bigfotmbottom">
        <div id="printpdf" class="col12 whiteblock">
                <a href="#" class="button button-yellowbb" id="genpdf">Generate pdf</a>
        </div>
</div>