Simple method to judge if there is a scrollbar in jQuery

Using jQuery to control the scroll bar to scroll and then judge whether the scroll bar has an offset. If there is, then there is a scroll bar, otherwise there is no scroll bar.

<script type="text/javascript">
$(function(){
  $("body").scrollTop(10);//Control the scroll bar to move down10px
  if( $("body").scrollTop()>0 ){
    alert("There is a scroll bar");
  }
    alert("No scroll bar");
  }
  $("body").scrollTop(0);//Scroll to the top of the scroll bar
});
</script>

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