个人封装JavaScript函数

 function get_next_day(str_date){
         var d="";
         d=new Date(str_date);
         d.setDate(d.getDate()+1);
         var y=d.getFullYear();
         var m=d.getMonth()+1;
         var dd=d.getDate() < 10?'0'+parseInt(d.getDate()):parseInt(d.getDate());
         return y+"-"+m+"-"+dd;
 }

 function count_days(date_in,date_out){

         var tmp_datein     = date_in.replace(/:/g,'-');
             tmp_datein     = tmp_datein.replace(/ /g,'-');
         var tmp_dateout = date_out.replace(/:/g,'-');
             tmp_dateout = tmp_dateout.replace(/ /g,'-');
         var date_time1    = tmp_datein.split('-');
         var date_time2     = tmp_dateout.split('-');

         var timestamp1    = new Date(Date.UTC(date_time1[0],date_time1[1]-1,date_time1[2]));
         var    unix_time1 = parseInt(timestamp1.getTime()/1000);

         var timestamp2    = new Date(Date.UTC(date_time2[0],date_time2[1]-1,date_time2[2]));
         var    unix_time2 = parseInt(timestamp2.getTime()/1000);

         var nights_num = (unix_time2-unix_time1)/(24*3600);

         return nights_num;

 }