完美运动框架

function startMove(obj, json, fnEnd) //换为json，如：startMove(oDiv, {width: 400, height: 400})
{
clearInterval(obj.timer);
obj.timer = setInterval(function() {

var bStop = true; //关键 //假设：所有的值都已经到了

for (var attr in json) //用一个循环，把原来的那套东西包在里面，每次定时器执行的时候，都会循环，循环的次数取决于json里面写了什么
{

var cur = 0;

if (attr == 'opacity') {
cur = Math.round(parseFloat(getStyle(obj, attr)) * 100); //因为这里，会出问题，小数
} else {
cur = parseInt(getStyle(obj, attr));
}

var speed = (json[attr] - cur) / 6;

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

if (cur != json[attr]) bStop = false;

if (attr == 'opacity') {
obj.style.filter = 'alpha(opacity:' + (cur + speed) + ')';
obj.style.opacity = (cur + speed) / 100;

} else {
obj.style[attr] = cur + speed + 'px';
}

}

if (bStop) //如果所有的值都到了，关闭定时器
{
clearInterval(obj.timer);

if (fnEnd) fnEnd();
}

},
30);
}

function getStyle(obj, name) {
if (obj.currentStyle) {
return obj.currentStyle[name];
} else {
return getComputedStyle(obj, false)[name];
}
}