$(function(){
   let ts = null;
   ts = setinterval(function(){
    if($('.page_con .page_a').length > 0){
  	      clearinterval(ts) 
          $('.page_prev').text('上一页');
          $('.page_next').text('下一页');
     }
    },200)
    $(document).on('click','.page_con .page_a',function(){
       settimeout(function(){
          $('.page_prev').text('上一页');
          $('.page_next').text('下一页');
     
       },500)
    })
  })