js 渐变运动框架

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<style>

div{width:100px;height:100px;background:red;filter:alpha(opacity=100);opacity:1;}

</style>

<script>

    function getStyle(obj,attr){

        return obj.currentStyle ? obj.currentStyle[attr]:getComputedStyle(obj)[attr];

    }

    function startMove(obj,attr,target,fn){

        clearInterval(obj.timer);

        obj.timer = setInterval(function(){

            if(attr == 'opacity'){

                var iCur = parseInt(parseFloat(getStyle(obj,attr))*100);

            }else{

                var iCur = parseInt(getStyle(obj,attr));

            }

            var speed = (target-iCur)/8;

            speed = speed >0 ? Math.ceil(speed):Math.floor(speed);

            if(iCur == target){

                clearInterval(obj.timer);

                fn && fn();

            }else{

                if(attr == 'opacity'){

                    obj.style.filter = 'alpha(opacity='+(iCur+speed)+');';

                    obj.style[attr] = (iCur+speed)/100;

                }else{

                    obj.style[attr] = iCur+speed+'px';

                }

            }

        },30);

    }

    window.onload = function(){

        var arrInput = document.getElementsByTagName('input')[0];

        var arrDiv = document.getElementsByTagName('div')[0];

        arrInput.onclick = function(){

            startMove(arrDiv,'width',300,function(){

                startMove(arrDiv,'height',300,function(){

                    startMove(arrDiv,'opacity',30);

                });

            });

        };

    };

</script>

</head>

<body>

<input type='button' value = '开始运动'/>

<div></div>

</body>

</html>
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js 渐变运动框架

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