//上移
$(‘.add_small_wrap‘).on(‘click‘, ‘.shangyi‘, function(){
var $curBlock = $(this).parents(‘.add_small‘);
var $prveBlock = $curBlock.prev(‘.add_small‘);
$curBlock.after($prveBlock); 
});
//下移
$(‘.add_small_wrap‘).on(‘click‘, ‘.xiayi‘, function(){
var $curBlock = $(this).parents(‘.add_small‘);
var $nextBlock = $curBlock.next(‘.add_small‘);
$curBlock.before($nextBlock); 
});