top、clientTop、scrollTop、offsetTop 图示说明如下: 示列代码: <html> <head> <title>51windows.Net </title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style type="text/css"> </style> </head> <body> <SCRIPT LANGUAGE="JavaScript"> var s = ""; s += "/r/n网页可见区域宽:"+ document.body.clientWidth; s += "/r/n网页可见区域高:"+ document.body.clientHeight; s += "/r/n网页可见区域宽:"+ document.body.offsetWidth +" (包括边线的宽)"; s += "/r/n网页可见区域高:"+ document.body.offsetHeight +" (包括边线的宽)"; s += "/r/n网页正文全文宽:"+ document.body.scrollWidth; s += "/r/n网页正文全文高:"+ document.body.scrollHeight; s += "/r/n网页被卷去的高:"+ document.body.scrollTop; s += "/r/n网页被卷去的左:"+ document.body.scrollLeft; s += "/r/n网页正文部分上:"+ window.screenTop; s += "/r/n网页正文部分左:"+ window.screenLeft; s += "/r/n屏幕分辨率的高:"+ window.screen.height; s += "/r/n屏幕分辨率的宽:"+ window.screen.width; s += "/r/n屏幕可用工作区高度:"+ window.screen.availHeight; s += "/r/n屏幕可用工作区宽度:"+ window.screen.availWidth; alert(s); </SCRIPT> </body> </html>