Posted in Javascript onJanuary 08, 2016
本文实例讲述了JavaScript缓冲运动实现方法。分享给大家供大家参考，具体如下：
实现原理：(目标距离-当前距离) / 基数 = 速度(运动距离越大速度越小，运动距离和速度成反比)
(500 - oDiv.offsetLeft) / 7 = iSpeed;
需要注意：当计算出来的速度有小数时需要取整；
(500 - oDiv.offsetLeft) / 7 = iSpeed; iSpeed = iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
例子1：滑块缓冲运动
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>缓冲运动</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute; top:50px; left:0;}
span{ width:1px; height:300px; background:black; position:absolute; left:300px; top:0; display:block;}
</style>
<script>
window.onload = function()
{
var oBtn = document.getElementById('btn1');
var oDiv = document.getElementById('div1');
oBtn.onclick = function()
{
startMove(oDiv, 300);
};
};
var timer = null;
function startMove(obj, iTarget)
{
clearInterval(timer);
timer = setInterval(function(){
var iSpeed = (iTarget - obj.offsetLeft)/8;
iSpeed = iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
if(iTarget==obj.offsetLeft){
clearInterval(timer);
}else{
obj.style.left = obj.offsetLeft + iSpeed + 'px';
}
}, 30);
}
</script>
</head>
<body>
<input id="btn1" type="button" value="移动" />
<div id="div1"></div>
<span></span>
</body>
</html>
例子2：侧边栏滑动
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>侧边栏滑动</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute; right:0; top:0;}
</style>
<script>
window.onload = window.onscroll = function()
{
var oDiv = document.getElementById('div1');
var iScrollTop = document.documentElement.scrollTop || document.body.scrollTop;
var clientHeight = document.documentElement.clientHeight;
var iH = (clientHeight - oDiv.offsetHeight)/2 + iScrollTop;
//oDiv.style.top = iH + 'px';
startMove(oDiv, parseInt(iH));
};
var timer = null;
function startMove(obj, iTarget)
{
clearInterval(timer);
timer = setInterval(function(){
var iSpeed = (iTarget - obj.offsetTop) / 8;
iSpeed = iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
if(obj.offsetTop == iTarget){
clearInterval(timer);
}else{
obj.style.top = obj.offsetTop + iSpeed + 'px';
}
}, 30);
}
</script>
</head>
<body style="height:2000px;">
<div id="div1"></div>
</body>
</html>
更多关于JavaScript运动效果相关内容可查看本站专题：《JavaScript运动效果与技巧汇总》
希望本文所述对大家JavaScript程序设计有所帮助。
JavaScript缓冲运动实现方法(2则示例)
- Author -
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