function startMove(obj,json,fn){

    var flag=true;//标志所有运动是否到达目标值

    clearInterval(obj.timer);

    obj.timer=setInterval(function(){

    for(var attr in json){

    var curr=0;

    //判断是否为透明度

    if(attr=='opacity'){

        curr=Math.round(parseFloat(getStyle(obj,attr))*100);

    }else{

        curr=parseInt(getStyle(obj,attr));

    }

    //移动速度处理

    var speed=0;

    speed=(json[attr]-curr)/10;

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

    if(curr!=json[attr]){

        flag=false;

    }

    if (attr=='opacity') {

        obj.style.filter='alpha(opacity:'+(curr+speed)+")";

        obj.style.opacity=(curr+speed)/100;

    }else{

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

    }

}

    if(flag){

        clearInterval(obj.timer);

        if(fn){

            fu();

        }

    }

},30);

}

//取样式

    function getStyle(obj,attr){

        if(obj.currentStyle){//IE取样式

            return obj.currentStyle[attr];

        }else{

        return getComputedStyle(obj,false)[attr];

        }

}