Javascript模拟加速运动与减速运动代码分享

加速运动,即一个物体运动时速度越来越快;减速运动,即一个物体运动时速度越来越慢。现在用Javascript来模拟这两个效果,原理就是用setInterval或setTimeout动态改变一个元素与另外一个元素的距离,如xxx.style.left或xxx.style.marginLeft,然后每次运动后都使速度增加,这样加速运动的效果就出现了,减速运动是同样的道理。

下面是两个示例:

加速运动

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Javascript加速运动</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>

注:本示例中,点击GO后,div块会一直向右做加速运动

减速运动

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Javascript减速运动</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>

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