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上一層的元件與瀏覽器顯示範圍
- xxx=getElementById(id):取得元件
- xxx.parentNode 取得上一層的元件
- 瀏覽器顯示範圍
if (document.body && document.body.offsetWidth) {
viewportwidth = document.body.offsetWidth;
viewportheight= document.body.offsetHeight;}
else if (document.compatMode=='CSS1Compat' &&
document.documentElement &&
document.documentElement.offsetWidth ) {
viewportwidth = document.documentElement.offsetWidth;
viewportheight= document.body.offsetHeight;}
else if (typeof window.innerWidth != 'undefined') {
viewportwidth = window.innerWidth;
viewportheight = window.innerHeight;}