<!doctype html>
 <html>
  <head>
   <meta name="" content="">
   <title>Document</title>
  </head>
  <body>
   
 <script type="text/javascript">
 Date.prototype.Format = function(fmt) {
     var o = {   
         "M+" : this.getMonth()+1,                 //月份   
         "d+" : this.getDate(),                    //日   
         "h+" : this.getHours(),                   //小时   
         "m+" : this.getMinutes(),                 //分   
         "s+" : this.getSeconds(),                 //秒   
         "q+" : Math.floor((this.getMonth()+3)/3), //季度   
         "S"  : this.getMilliseconds()             //毫秒   
     };   
     if(/(y+)/.test(fmt))   
         fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));   
     for(var k in o)   
         if(new RegExp("("+ k +")").test(fmt))   
             fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));   
     return fmt;   
 }
 function getMonthAndDate(day) {
     var date = new Date();
     date.setDate(date.getDate()+day);//获取day天后的日期
     var m = date.getMonth()+1;//获取当前月份的日期
     var d = date.getDate();
     var dateStr = m+"-"+d;
     return new Date(dateStr).Format("MM-dd");
 }
  alert(getMonthAndDate(1));
   </script>
  </body>
 </html>