暫時總結(jié)的判斷方法如下: var h1 = document.body.clientHeight; var h2 = document.documentElement.clientHeight; var isXhtml = (h2<=h1&&h2!=0)?true:false; //判斷當(dāng)前頁面的Doctype是否為Xhtml var body = isXhtml?document.documentElement:document.body; alert(body.clientHeight); //最終結(jié)果比較一致