window.οnlοad=function (){    var oDiv=document.getElementById('div1');        var lastX=0;    var lastY=0;        oDiv.onmousedown=function (ev)    {        var oEvent=ev||event;                var disX=oEvent.clientX-oDiv.offsetLeft;        var disY=oEvent.clientY-oDiv.offsetTop;                document.onmousemove=function (ev)        {            var oEvent=ev||event;                        var l=oEvent.clientX-disX;            var t=oEvent.clientY-disY;                        oDiv.style.left=l+'px';            oDiv.style.top=t+'px';                        iSpeedX=l-lastX;            iSpeedY=t-lastY;                        lastX=l;            lastY=t;                        document.title='x:'+iSpeedX+', y:'+iSpeedY;        };                document.onmouseup=function ()        {            document.onmousemove=null;            document.onmouseup=null;                        startMove();        };                clearInterval(timer);    };};var timer=null;var iSpeedX=0;var iSpeedY=0;function startMove(){    clearInterval(timer);        timer=setInterval(function (){        var oDiv=document.getElementById('div1');                iSpeedY+=3;                var l=oDiv.offsetLeft+iSpeedX;        var t=oDiv.offsetTop+iSpeedY;                if(t>=document.documentElement.clientHeight-oDiv.offsetHeight)        {            iSpeedY*=-0.8;            iSpeedX*=0.8;            t=document.documentElement.clientHeight-oDiv.offsetHeight;        }        else if(t<=0)        {            iSpeedY*=-1;            iSpeedX*=0.8;            t=0;        }                if(l>=document.documentElement.clientWidth-oDiv.offsetWidth)        {            iSpeedX*=-0.8;            l=document.documentElement.clientWidth-oDiv.offsetWidth;        }        else if(l<=0)        {            iSpeedX*=-0.8;            l=0;        }                if(Math.abs(iSpeedX)<1)        {            iSpeedX=0;        }                if(Math.abs(iSpeedY)<1)        {            iSpeedY=0;        }                if(iSpeedX==0 && iSpeedY==0 && t==document.documentElement.clientHeight-oDiv.offsetHeight)        {            clearInterval(timer);            alert('停止');        }        else        {            oDiv.style.left=l+'px';            oDiv.style.top=t+'px';        }                document.title=iSpeedX;    }, 30);}