javascript运动效果实例总结(放大缩小、滑动淡入、滚动)


本文实例总结了javascript运动效果实现与用法。分享给大家供大家参考,具体如下:

一、图片放大缩小效果:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>图片放大缩小</title>
<style>
*{ margin:0; padding:0; list-style:none;}
#ulList{ margin:50px;}
#ulList li{ margin:10px; width:100px; height:100px; float:left; background:#ddd; border:1px solid black;}
</style>
<script>
window.onload = function()
{
 var oUl = document.getElementById('ulList');
 var aLi = oUl.getElementsByTagName('li');
 var zIndex = 2;
 //布局转换
 for(var i=0;i<aLi.length;i++){
  aLi[i].style.left = aLi[i].offsetLeft + 'px';
  aLi[i].style.top = aLi[i].offsetTop + 'px';
 }
 for(var i=0;i<aLi.length;i++){
  aLi[i].style.position = 'absolute';
  aLi[i].style.margin = '0';
 }
 for(var i=0;i<aLi.length;i++){
  aLi[i].onmouseover = function()
  {
   this.style.zIndex = zIndex++;
   startMove(this, {width:200, height:200, marginLeft:-50, marginTop:-50});
  };
  aLi[i].onmouseout = function()
  {
   startMove(this, {width:100, height:100, marginLeft:0, marginTop:0});
  };
 }
};
function getStyle(obj, attr)
{
 if(obj.currentStyle){
  return obj.currentStyle[attr];
 }else{
  return getComputedStyle(obj, false)[attr];
 }
}
function startMove(obj, json, fn)
{
 clearInterval(obj.timer);
 obj.timer=setInterval(function (){
  var bStop=true;
  for(var attr in json)
  {
   var iCur=0;
   if(attr=='opacity')
   {
    iCur=parseInt(parseFloat(getStyle(obj, attr))*100);
   }
   else
   {
    iCur=parseInt(getStyle(obj, attr));
   }
   var iSpeed=(json[attr]-iCur)/8;
   iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
   if(iCur!=json[attr])
   {
    bStop=false;
   }
   if(attr=='opacity')
   {
    obj.style.filter='alpha(opacity:'+(iCur+iSpeed)+')';
    obj.style.opacity=(iCur+iSpeed)/100;
   }
   else
   {
    obj.style[attr]=iCur+iSpeed+'px';
   }
  }
  if(bStop)
  {
   clearInterval(obj.timer);
   if(fn)
   {
    fn();
   }
  }
 }, 30)
}
</script>
</head>
<body>
<ul id="ulList">
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
</ul>
</body>
</html>

二、信息滑动淡入加载显示效果:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#msgBox{ width:500px; margin:0 auto; padding:5px;}
.msgList{ filter:alpha(opacity=0); opacity:0; font-size:12px; line-height:1.6; border-bottom:1px solid #ddd;}
.box{ float:left;}
</style>
<script>
window.onload = function()
{
 var oTxt = document.getElementById('txt1');
 var oBtn = document.getElementById('btn1');
 var oBox = document.getElementById('msgBox');
 oBtn.onclick = function()
 {
  var oMsg = document.createElement('div');
  var aDiv = oBox.getElementsByTagName('div');
  oMsg.className = 'msgList';
  oMsg.innerHTML = oTxt.value;
  oTxt.value = '';
  if(aDiv.length==0){
   oBox.appendChild(oMsg);
  }else{
   oBox.insertBefore(oMsg, aDiv[0]);
  }
  var iH = oMsg.offsetHeight;
  oMsg.style.height = 0;
  startMove(oMsg, {height:iH}, function(){
   startMove(oMsg, {opacity:100});
  });
 };
};
function getStyle(obj, attr)
{
 if(obj.currentStyle){
  return obj.currentStyle;
 }else{
  return getComputedStyle(obj, false)[attr];
 }
}
function startMove(obj, json, fn)
{
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
  var bStop = true;
  for(var attr in json){
   var iCur = 0;
   if(attr == 'opacity'){
    iCur = Math.round((parseFloat(getStyle(obj, attr))*100));
   }else{
    iCur = parseInt(getStyle(obj, attr));
   }
   var iSpeed = (json[attr] - iCur) / 8;
   iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
   if(iCur != json[attr]){
    bStop = false;
   }
   if(attr == 'opacity'){
    obj.style.filter = 'alpha(opacity=' + (iCur + iSpeed)+')';
    obj.style.opacity = (iCur + iSpeed) / 100;
   }else{
    obj.style[attr] = iCur + iSpeed + 'px';
   }
  }
  if(bStop){
   clearInterval(obj.timer);
   if(fn){
    fn();
   }
  }
 }, 30);
}
</script>
</head>
<body>
<div class="box">
 <textarea id="txt1" cols="40" rows="10"></textarea><br />
 <input id="btn1" type="button" value="提交信息" />
</div>
<div id="msgBox">
</div>
</body>
</html>

三、无缝滚动效果:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
*{ margin:0; padding:0; list-style:none;}
#div1{ width:480px; height:120px; margin:50px auto; border:1px solid black; position:relative; overflow:hidden;}
#div1 li{ float:left; padding:10px;}
#div1 li img{ display:block;}
#div1 ul{ position:absolute;}
</style>
<script>
window.onload = function()
{
 var oDiv = document.getElementById('div1');
 var oUl = oDiv.getElementsByTagName('ul')[0];
 var aLi = oUl.getElementsByTagName('li');
 var aBtn = document.getElementsByTagName('input');
 var iSpeed = -3;
 var timer = null;
 oUl.innerHTML += oUl.innerHTML;
 oUl.style.width = aLi[0].offsetWidth * aLi.length + 'px';
 timer = setInterval(move, 30);
 aBtn[0].onclick = function()
 {
  iSpeed = -3;
 };
 aBtn[1].onclick = function()
 {
  iSpeed = 3;
 };
 oDiv.onmouseover = function()
 {
  clearInterval(timer);
 };
 oDiv.onmouseout = function()
 {
  timer = setInterval(move, 30);
 };
 function move(){
  if(oUl.offsetLeft<-oUl.offsetWidth/2){
   oUl.style.left = '0px';
  }else if(oUl.offsetLeft>0){
   oUl.style.left = -oUl.offsetWidth/2 + 'px';
  }
  oUl.style.left = oUl.offsetLeft + iSpeed + 'px';
 }
};
</script>
</head>
<body>
<input type="button" value="向左" />
<input type="button" value="向右" />
<div id="div1">
 <ul>
  <li><img src="images/1.jpg" width="100" height="100" /></li>
  <li><img src="images/2.jpg" width="100" height="100" /></li>
  <li><img src="images/3.jpg" width="100" height="100" /></li>
  <li><img src="images/4.jpg" width="100" height="100" /></li>
 </ul>
</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。



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