1，匀速动画效果
window.onload = function(){
 var odiv = document.getElementById(\'odiv\');
 odiv.onmouseover = function(){
  startMover(0);
 }
 odiv.onmouseout = function(){
  startMover(-200);
 }
}
var timer = null;
function startMover(itarget){//目标值
 clearInterval(timer);//执行当前动画同时清除之前的动画
 var odiv = document.getElementById(\'odiv\');
 timer = setInterval(function(){
 var speed = 0;
 if(odiv.offsetLeft > itarget){
  speed = -1;
 }
 else{
  speed = 1;
 }
 if(odiv.offsetLeft == itarget){
  clearInterval(timer);
 }
 else{
  odiv.style.left = odiv.offsetLeft+speed+\'px\';
  }
 },30);
}


2，缓冲动画效果
window.onload = function(){
 var odiv = document.getElementById(\'odiv\');
 odiv.onmouseover = function(){
  startMover(0);
 }
 odiv.onmouseout = function(){
  startMover(-200);
 }
}
var timer = null;
function startMover(itarget){//速度和目标值
 clearInterval(timer);//执行当前动画同时清除之前的动画
 var odiv = document.getElementById(\'odiv\');
 timer = setInterval(function(){
 var speed = (itarget-odiv.offsetLeft)/10;//缓冲动画的速度参数变化值
 //如果速度是大于0，说明是向右走，那么就向上取整
 speed = speed>0?Math.ceil(speed):Math.floor(speed);
 //Math.floor();向下取整
 if(odiv.offsetLeft == itarget){
  clearInterval(timer);
 }
 else{
  //clientLeft 返回对象的offsetLeft属性值和到当前窗口左边的真实值之间的距离 
  odiv.style.left = odiv.offsetLeft+speed+\'px\';
  }
 },30);
}

3，透明度动画
window.onload = function(){
 var odiv = document.getElementsByTagName(\'div\');
 for(var i=0;i<odiv.length;i++)
 {
   odiv[i].onmouseover = function(){
   startOP(this,100);
  }
  odiv[i].onmouseout = function(){
   startOP(this,30);
  }
  odiv[i].timer = null;//事先定义
  odiv[i].alpha = null;//事先定义
  //这里发现一个问题，对象的动画属性可以不定义，但是透明度属性必须定义，否则报错
 }
}
function startOP(obj,utarget){
  clearInterval(obj.timer);//先关闭定时器
  obj.timer = setInterval(function(){
  var speed = 0;
  if(obj.alpha>utarget){
  speed = -10;
  }
  else{
  speed = 10;
  }
  obj.alpha = obj.alpha+speed;
  if(obj.alpha == utarget){
  clearInterval(obj.timer);
  }
  obj.style.filter = \'alpha(opacity:\'+obj.alpha+\')\';//基于IE的
  obj.style.opacity = parseInt(obj.alpha)/100;
  },30); 
}

4，多物体动画

window.onload = function(){
 var olist = document.getElementsByTagName(\'li\');
 for(var i=0; i<olist.length;i++)
 {
  olist[i].onmouseover = function(){
  startmov(this,400);
  };
  olist[i].onmouseleave = function(){
  startmov(this,200);
  };
  olist[i].timer = null;
 }
 function startmov(obj,itarget){
  clearInterval(obj.timer);//执行动画之前清除动画
  obj.timer = setInterval(function(){
   var speed =0;
   speed = (itarget - obj.offsetWidth)/8;
   speed = speed>0?Math.ceil(speed):Math.floor(speed);
   if(obj.offsetWidth == itarget){
   clearInterval(obj.timer);
   }
   else{
   obj.style.width = obj.offsetWidth+speed+\'px\';
   }
  },30);
 }
}

5，获取样式动画

window.onload = function(){
        var odiv = document.getElementById(\'odiv\');
        odiv.onmouseover = function(){
            startMov(this);
        };
        function startMov(obj){
            setInterval(function(){
                obj.style.width = parseInt(getStyle(obj,\'width\'))+1+\'px\';
                obj.style.fontSize = parseInt(getStyle(obj,\'fontSize\'))+1+\'px\';
            },30);
        }
        function getStyle(obj,attr)
        {
            if(obj.currentStyle){
                return obj.currentStyle[attr];
            }
            else{
                return getComputedStyle(obj,false)[attr];
            }
        }
    }

6，多物体复杂动画

window.onload = function(){
 var li1 = document.getElementById(\'li1\');
 var li2 = document.getElementById(\'li2\');
 li1.onmouseover = function(){
  startMov(this,400,\'width\');
 };
 li1.onmouseout = function(){
  startMov(this,200,\'width\');
 };
 li2.onmouseover = function(){
  startMov(this,200,\'height\');
 };
 li2.onmouseout = function(){
  startMov(this,100,\'height\');
 };
 function startMov(obj,itarget,attr){
  clearInterval(obj.timer);//执行动画之前清除动画
  obj.timer = setInterval(function(){
   var icur = parseInt(getStyle(obj,attr));
   var speed =0;
   speed = (itarget - icur)/8;
   speed = speed>0?Math.ceil(speed):Math.floor(speed);
   if(icur == itarget){
   clearInterval(obj.timer);
   }
   else{
   obj.style[attr] = icur+speed+\'px\';
   }
  },30);
 }
 function getStyle(obj,attr)
 {
  if(obj.currentStyle){
  return obj.currentStyle[attr];
  }
  else{
  return getComputedStyle(obj,false)[attr];
  }
 }
}
7，多物体复杂动画（带透明度的）

window.onload = function(){
 var li1 = document.getElementById(\'li1\');
 var li2 = document.getElementById(\'li2\');
 li1.onmouseover = function(){
  startMov(this,100,\'opacity\');
 };
 li1.onmouseout = function(){
  startMov(this,30,\'opacity\');
 };
 li2.onmouseover = function(){
  startMov(this,200,\'height\');
 };
 li2.onmouseout = function(){
  startMov(this,100,\'height\');
 }
 li1.timer = null;
 li2.timer = null;
 function startMov(obj,itarget,attr){
  clearInterval(obj.timer);//执行动画之前清除动画
  obj.timer = setInterval(function(){
   var icur = 0;
   if(attr == \'opacity\'){
   icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
   //计算机在计算小数的时候往往是不准确的！
   }
   else{
   icur = parseInt(getStyle(obj,attr));
   }
   var speed =0;
   speed = (itarget - icur)/8;
   speed = speed>0?Math.ceil(speed):Math.floor(speed);
   if(icur == itarget){
   clearInterval(obj.timer);
   }
   else{
    if(attr == \'opacity\'){
    obj.style.filter = \'alpha(opacity:\'+(icur+speed)+\')\';
    obj.style.opacity = (icur+speed)/100;
    }
    else{
    obj.style[attr] = icur+speed+\'px\';
    } 
   }
  },30);
 }
 function getStyle(obj,attr)
 {
  if(obj.currentStyle){
  return obj.currentStyle[attr];
  }
  else{
  return getComputedStyle(obj,false)[attr];
  }
 }
}

8，链式动画
window.onload = function(){
 var li1 = document.getElementById(\'li1\');
 li1.onmouseover = function(){
  startMov(li1,400,\'width\',function(){
   startMov(li1,200,\'height\',function(){
   startMov(li1,100,\'opacity\');
   });
  });
 };
 li1.onmouseout = function(){
  startMov(li1,30,\'opacity\',function(){
   startMov(li1,100,\'height\',function(){
   startMov(li1,100,\'width\');
   });
  });
 };
 li1.timer = null;
 function startMov(obj,itarget,attr,fn){//fn回调函数
  clearInterval(obj.timer);//执行动画之前清除动画
  obj.timer = setInterval(function(){
   var icur = 0;
   if(attr == \'opacity\'){
   icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
   //计算机在计算小数的时候往往是不准确的！
   }
   else{
   icur = parseInt(getStyle(obj,attr));
   }
   var speed =0;
   speed = (itarget - icur)/8;
   speed = speed>0?Math.ceil(speed):Math.floor(speed);
   if(icur == itarget){
   clearInterval(obj.timer);
   if(fn){
    fn();
   }
   }
   else{
    if(attr == \'opacity\'){
    obj.style.filter = \'alpha(opacity:\'+(icur+speed)+\')\';
    obj.style.opacity = (icur+speed)/100;
    }
    else{
    obj.style[attr] = icur+speed+\'px\';
    } 
   }
  },30);
 }
 function getStyle(obj,attr)
 {
  if(obj.currentStyle){
  return obj.currentStyle[attr];
  }
  else{
  return getComputedStyle(obj,false)[attr];
  }
 }
}

9，多物体同时运动动画
window.onload = function(){
 var li1 = document.getElementById(\'li1\');
 li1.onmouseover = function(){
  startMov(li1,{width:201,height:200,opacity:100});
 };
 li1.onmouseout = function(){
  startMov(li1,{width:200,height:100,opacity:30});
 };
 li1.timer = null;
 function startMov(obj,json,fn){//fn回调函数
  clearInterval(obj.timer);//执行动画之前清除动画
  var flag = true;//是否动画都完成了
  obj.timer = setInterval(function(){
   for(var attr in json){
   var icur = 0;
   if(attr == \'opacity\'){
   icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
   //计算机在计算小数的时候往往是不准确的！
   }
   else{
   icur = parseInt(getStyle(obj,attr));
   }
   var speed =0;
   speed = (json[attr] - icur)/8;
   speed = speed>0?Math.ceil(speed):Math.floor(speed);
   if(icur != json[attr]){
   flag = false;
   }
   if(attr == \'opacity\'){
   obj.style.filter = \'alpha(opacity:\'+(icur+speed)+\')\';
   obj.style.opacity = (icur+speed)/100;
   }
   else{
   obj.style[attr] = icur+speed+\'px\';
   }
   if(flag){
   clearInterval(obj.timer);
   if(fn){
    fn();
   }
   }
  }
  },30);
 }
 function getStyle(obj,attr)
 {
  if(obj.currentStyle){
  return obj.currentStyle[attr];
  }
  else{
  return getComputedStyle(obj,false)[attr];
  }
 }
}