HTML body的滚动条禁止与启用

滚动条的启用:

<script type="text/javascript">
 //启用滚动条
 $(document.body).css({
   "overflow-x":"auto",
   "overflow-y":"auto"
 });
</script> 

滚动条的禁用: 

<script type="text/javascript">
  //禁止滚动条
 $(document.body).css({
   "overflow-x":"hidden",
   "overflow-y":"hidden"
 });
</script>