JS简单几步实现滑动加载数据

//滑动
function getScrollTop() 
{
  var scrollTop = 0;
  if (document.documentElement && document.documentElement.scrollTop) {
      scrollTop = document.documentElement.scrollTop;
   }else if (document.body) {
	scrollTop = document.body.scrollTop;
   }
	return scrollTop;
}

//获取当前可视范围的高度
function getClientHeight()
{
  var clientHeight = 0;
  if (document.body.clientHeight && document.documentElement.clientHeight) {
     clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight);
  }else {
     clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
  }
     return clientHeight;
}
//获取文档完整的高度
function getScrollHeight() 
{
     return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
} 

//绑定事件
window.onscroll = function () 
{
  if (getScrollTop() + getClientHeight() == getScrollHeight()) {
    //dosomething
  }
 
}