JavaScript获取网页高度宽度

JavaScript获取网页高度宽度

    JavaScript获取网页高度宽度 

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;
 }

 /********************
 * 取窗口可视范围的高度 
*******************/
function getClientHeight()
 {
 var clientHeight=0;
 if(document.body.clientHeight&&document.documentElement.clientHeight)
 {
 var clientHeight = (document.body.clientHeight<document.documentElement.clientHeight)?docum
 ent.body.clientHeight:document.documentElement.clientHeight; 
}
 else
 {
 var clientHeight = (document.body.clientHeight>document.documentElement.clientHeight)?docum
 ent.body.clientHeight:document.documentElement.clientHeight; 
}
 return clientHeight;
 }

 /********************
 * 取文档内容实际高度 
*******************/
function getScrollHeight()
 {
 return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
 }