正在學習javascript 的朋友可以把它當作小練習動手做一做。加強自己的動手編碼能力。
參考代碼：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><title>ggggg</title><link rel="stylesheet" type="text/css" href=""><meta http-equiv="content-type" content="text/html;charset=utf-8"><!--js代碼可以放置在任意位置，按照先後順序依次執行 一般放在head標籤之間--><script type="text/javascript"> //定義全域變數 //小球座標 ballX=0; ballY=0; //小球在x,y軸移動的方向 directX=1; directY=1; //小球移動 function ballMove(){ //小球移動 ballX+=2*directX; ballY+=2*directY; //同時修改小球的top 和width div2.style.top=ballY+'px'; div2.style.left=ballX+'px'; //window.alert(div1.offsetWidth);//offsetwidth在JS中是擷取元素的寬,對應的還有offsetHeight //判斷轉向 //learInterval(i); if(ballX+div2.offsetWidth>=div1.offsetWidth ||ballX<=0){ directX=-directX; } if(ballY+div2.offsetHeight>=div1.offsetHeight || ballY<=0){ directY=-directY; } } //定時器 var i=setInterval("ballMove()",10);</script></head><body> <div id="div1" style="width:400px;height:300px;border:1px solid silver;POSITION: absolute; TOP: 100px"> <div id="div2" style="position:absolute;left:0px;top:0px;"><img src="ball.png"></div> </div></body></html>
圖:
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