用document.documentElement取代document.body的原因分析
2024-05-06 14:12:51
供稿：網友
IE6在頁面內容超出窗口大小時將寬度屬性scrollWidth、clientWidth、offsetWidth都解釋為內容實際寬度。
上次的測試說明了document.body屬性并不會給我們返回預期的結果，比如我們用document.body.clientHeight原本想取得“頁面可見區域高度”，可實際上返回的是“頁面實際內容高度”。
那我們怎么辦呢？難道加上了文檔DTD類型之后就再也不能取到“可見區域高度”和“內容實際寬度”等等屬性了嗎？
代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>documentElement</title>
<style type="text/css">
body{margin:0;padding:0;font:12px/150% arial;}
</style>
<script type="text/javascript">
function a() {
var scrollTop;
var scrollLeft;
if (typeof window.pageYOffset != 'undefined') {
scrollTop = window.pageYOffset;
scrollLeft = window.pageXOffset;
}
else if (typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat') {
scrollTop = document.documentElement.scrollTop;
scrollLeft = document.documentElement.scrollLeft;
}
else if (typeof document.body != 'undefined') {
scrollTop = document.body.scrollTop;
scrollLeft = document.body.scrollLeft;
}
var scrollHeight = document.documentElement.scrollHeight;
var scrollWidth = document.documentElement.scrollWidth;
var clientWidth = document.documentElement.clientWidth;
var clientHeight = document.documentElement.clientHeight;
var offsetWidth = document.documentElement.offsetWidth;
var offsetHeight = document.documentElement.offsetHeight;
var screenTop = window.screenTop;
var screenBottom = window.screenBottom;
var screenLeft = window.screenLeft;
var sheight = window.screen.height;
var swidth = window.screen.width;
var availHeight = window.screen.availHeight;
var availWidth = window.screen.availWidth;
document.getElementById('scrollTop').value = scrollTop;
document.getElementById('scrollLeft').value = scrollLeft;
document.getElementById('scrollHeight').value = scrollHeight;
document.getElementById('scrollWidth').value = scrollWidth;
document.getElementById('clientWidth').value = clientWidth;
document.getElementById('clientHeight').value = clientHeight;
document.getElementById('offsetWidth').value = offsetWidth;
document.getElementById('offsetHeight').value = offsetHeight;
document.getElementById('screenTop').value = screenTop;
document.getElementById('screenBottom').value = screenBottom;
document.getElementById('screenLeft').value = screenLeft;
document.getElementById('sheight').value = sheight;
document.getElementById('swidth').value = swidth;
document.getElementById('availHeight').value = availHeight;
document.getElementById('availWidth').value = availWidth;
