JavaScript特效執行個體018-下降式瀏覽器，javascript018-
執行個體018 下降式瀏覽器執行個體說明本執行個體是在視窗開啟時，將整個視窗放在螢幕的最上面，使視窗無法在螢幕中進行顯示，然後動態地使視窗進行下移，直到視窗顯示在螢幕的左上方為止。技術要點本執行個體主要應用了screen對象的availHesht屬性來獲得當前螢幕工作區的高度，並用window對象的moveBy（）方法使視窗自動下移。下面對window對象的moveBy（）方法進行詳細的介紹。moveBy（）方法的文法格式：
window.moveBy(x,y)參數說明如下。x：水平位移量y：垂直位移量功能：按照指定位移量設定視窗的大小。實現過程實現功能的首頁面
<!DOCTYPE html><html><head><meta charset="utf-8"><title></title><script type="text/javascript">function drop(){var heig = window.screen.availHeight;if(self.moveBy){self.moveBy(0,-heig);for(i = Math.floor(heig/3);i>0;i--){self.moveBy(0,3);}}}</script></head><body onload = "drop()"><img src="new.jpg"/><br/><img src="new.jpg"/><br/><img src="new.jpg"/><br/><img src="new.jpg"/><br/></body></html>
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