这里需要注意：每个运动物体的定时器作为物体的属性独立出来互不影响，属性与运动对象绑定，不能公用。
运行效果截图如下：
例子：
<!doctype html> <html> <head> <meta charset="utf-8"> <title>多物体运动</title> <style> div{ width:100px; height:100px; background:red; float:left; margin:10px; border:1px solid black; opacity:0.3; filter:alpha(opacity=30);} </style> <script> window.onload = function() { var aDiv = document.getElementsByTagName('div'); aDiv[0].onmouseover = function() { startMove(this, 'width', 300); }; aDiv[0].onmouseout = function() { startMove(this, 'width', 100); }; aDiv[1].onmouseover = function() { startMove(this, 'height', 300); }; aDiv[1].onmouseout = function() { startMove(this, 'height', 100); }; aDiv[2].onmouseover = function() { startMove(this, 'opacity', 100); }; aDiv[2].onmouseout = function() { startMove(this, 'opacity', 30); }; aDiv[3].onmouseover = function() { startMove(this, 'borderWidth', 20); }; aDiv[3].onmouseout = function() { startMove(this, 'borderWidth', 1); }; }; function getStyle(obj, attr) { if(obj.currentStyle){ return obj.currentStyle[attr]; }else{ return getComputedStyle(obj, false)[attr]; } } function startMove(obj, attr, iTarget) { clearInterval(obj.timer); obj.timer = setInterval(function(){ var iCur = 0; if(attr == 'opacity'){ iCur = parseInt(parseFloat(getStyle(obj, attr)) * 100); }else{ iCur = parseInt(getStyle(obj, attr)); } var iSpeed = (iTarget - iCur) / 8; iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); if(iCur == iTarget){ clearInterval(obj.timer); }else{ if(attr == 'opacity'){ obj.style.filter = 'alpha(opacity='+ (iCur+iSpeed) +')'; obj.style.opacity = (iCur+iSpeed)/100; }else{ obj.style[attr] = iCur + iSpeed + 'px'; } } }, 30); } </script> </head> <body> <div></div> <div></div> <div></div> <div></div> </body> </html>