<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <script type="text/javascript"> document.write(document.body.scrollHeight+" ") document.write(document.body.scrollWidth+"<br/>") document.write(document.documentElement.scrollHeight+" ") document.write(document.documentElement.scrollWidth) </script> </body> </html>
document.body是DOM中Document对象里的body节点， document.documentElement是文档对象根节点(html)。