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Javascript類比加速運動與減速運動代碼分享，javascript減速
加速運動，即一個物體運動時速度越來越快；減速運動，即一個物體運動時速度越來越慢。現在用Javascript來類比這兩個效果，原理就是用setInterval或setTimeout動態改變一個元素與另外一個元素的距離，如xxx.style.left或xxx.style.marginLeft，然後每次運動後都使速度增加，這樣加速運動的效果就出現了，減速運動是同樣的道理。
下面是兩個樣本：
加速運動
複製代碼 代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Javascript加速運動</title>
<style type="text/css">
* {margin: 0; padding: 0;}
.div1 {width: 100px; height: 100px; background: #f60 url(qiuweiguan.gif) no-repeat center center;}
</style>
<script type="text/javascript">
var $$ = function (id) {
return document.getElementById(id);
}
window.onload = function () {
var oBtn = $$("btn1");
var oDiv = $$("div1");
var timer = null;
var speed = 0;
oBtn.onclick = function () {
clearInterval(timer);
timer = setInterval(function () {
speed ++;
oDiv.style.marginLeft = oDiv.offsetLeft + speed + "px";
}, 30);
}
}
</script>
</head>
<body id = "body">
<button id="btn1" class="btn1">GO</button>
<div id="div1" class="div1"></div>
</body>
</html>
註：本樣本中，點擊GO後，div塊會一直向右做加速運動
減速運動
複製代碼 代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Javascript減速運動</title>
<style type="text/css">
* {margin: 0; padding: 0;}
.div1 {width: 100px; height: 100px; background: #f60 url(qiuweiguan.gif) no-repeat center center;}
</style>
<script type="text/javascript">
var $$ = function (id) {
return document.getElementById(id);
}
window.onload = function () {
var oBtn = $$("btn1");
var oDiv = $$("div1");
var timer = null;
var speed = 30;
oBtn.onclick = function () {
clearInterval(timer);
timer = setInterval(function () {
speed — ;
oDiv.style.marginLeft = oDiv.offsetLeft + speed + "px";
}, 30);
}
}
</script>
</head>
<body id = "body">
<button id="btn1" class="btn1">GO</button>
<div id="div1" class="div1"></div>
</body>
</html>
註：本樣本中，點擊GO後，div塊會一直向右做減速運動，直到速度減為零後，速度變為負值，再向左做加速運動
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