本文實例講述了JS實現的小火箭發射動畫效果。分享給大家供大家參考，具體如下：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>小火箭發射</title> <style type="text/css"> *{ margin: 0px; padding: 0px; } .big{ width: 500px; height: 600px; border: 1px solid #16283B; float: left; position: relative; background-color: #16283B; } .btm{ height: 40px; width: 100px; background-color: royalblue; cursor: pointer; border: 1px solid blue; float: left; position: relative; top: 560px; left: 40px; } .btm span{ line-height: 40px; width: 100px; display: block; text-align: center; } .bt_stop{ height: 40px; width: 100px; background-color: royalblue; cursor: pointer; border: 1px solid blue; float: left; position: relative; top: 500px; left: -60px; } .bt_stop span{ line-height: 40px; width: 100px; display: block; text-align: center; } .rocket{ position: absolute; bottom: 18px; left: 180px; } </style> <script type="text/javascript"> // alert("is work!"); //任務1 火箭起飛 //任務2 火箭懸停 var start; function $(id) { return document.getElementById(id); } function fly() { start=self.setInterval("fly_do()",10); } function start_send() { alert('start'); fly(); } function stop() { //alert('stop'); window.clearInterval(start); } function getBottom(rocket) { var bottomf = rocket.style.bottom; bottomf = parseInt(bottomf); if (!bottomf){ bottomf=18; } bottomf++; return bottomf; } function fly_do() { //alert("this is fly"); //通過不斷改變rocket里面的css屬性bottom //獲取rocket對象 var rocket=$("yingshanhao"); var bottomf=getBottom(rocket); //改變屬性 rocket.style.bottom=bottomf+"px"; //慢慢飛起來 //js的時間函數 } </script></head><body> <div class="big"> <div class="rocket" id="yingshanhao"> <img src="images/rocket1.jpg" style="width: 25%;height:25%;position: relative;left: 40px;bottom: -20px;" > </div> </div> <div class="btm" onmouseover="javascript:stop();" onmouseout="javascript:start_send();"> <span>懸停按鈕</span> </div> <div class="bt_stop" onclick="javascript:fly();"> <span>發射按鈕</span> </div> </div></body></html>
希望本文所述對大家JavaScript程序設計有所幫助。
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