页面亟需滚动时就会出来

<style type="text/css">
/* 自定义div滚动条样式 */
.scrollDiv {
  overflow-x:hidden;
  overflow-y:auto;
  scrollbar-face-color : #EDEDED;
  scrollbar-darkshadow-color : #EDEDED;
}
</style>

$(document).ready(function(){
	setDivHeight();
});
 function setDivHeight() {
    // 扣除(顶部菜单<30>、列表页面菜单<30>、表头<30>、分页<37>、底部间隔<5>)
	var clientHeight = document.documentElement.clientHeight+80;
	var div = $("#tableListDiv");
	div.attr("style", "height:"+clientHeight+"px");
  }