'use strict';

function getStyle(obj,sName){

    return (obj.currentStyle||getComputedStyle(obj,false))[sName];

}

//function move(obj,json,time,type,fn)

function move(obj,json,options){

    options=options||{};

    options.time=options.time||700;

    options.type=options.type||'linear';

    var start={};

    var dis={};

    for(var name in json){

        start[name]=parseInt(getStyle(obj,name));

        if(isNaN(start[name])){

            //加默认值

            switch(name){

                case 'left':

                start[name]=obj.offsetLeft;

                break;

                case'top':

                start[name]=obj.offsetTop;

                break;

                case'width':

                start[name]=obj.offsetWidth;

                break;

                case'Height':

                start[name]=obj.offsetHeight;

                break

                case'opacity':

                start[name]=1;

                break;

                case'border':

                start[name]=0;

            }

        }

        dis[name]=json[name]-start[name];

    }

    var count=Math.floor(options.time/30);

    var n=0;

    clearInterval(obj.timer);

    obj.timer=setInterval(function(){

        n++;

        var ocr='';

        for(var name in json){

            switch(options.type){

                case'linear':

                var a=n/count;

                ocr=start[name]+a*dis[name];

                break;

                case'ease-in':

                var a=n/count;

                ocr=start[name]+Math.pow(a,3)*dis[name];

                break;

                case'ease-out':

                var a=(1-n/count);

                ocr=start[name]+(1-Math.pow(a,3))*dis[name];

                break;

            }

            if(name=='opacity'){

                obj.style[name]=ocr;

                obj.style[name]='filter:alpha(opacity='+ocr*100+')';

            }else{

            obj.style[name]=ocr+'px';

            }

        }

        if(n==count){

            clearInterval(obj.timer);

            options.end&&options.end();

        }

    },30);

}