html中右边跟随移动的悬浮窗口,JS实现右侧悬浮框随着页面的上下轮动而移动

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#div{

200px;

height: 100px;

background: red;

position: absolute;

right: 0;

bottom: 40%;

}

window.onscroll = function () {

var oDiv = document.getElementById('div');

var scrollTop = document.documentElement.scrollTop||document.body.scrollTop;

//oDiv.style.top = (document.documentElement.clientHeight-oDiv.offsetHeight)/2+scrollTop+'px';

startMove(parseInt((document.documentElement.clientHeight-oDiv.offsetHeight)/2+scrollTop));

};

var time = null;

function startMove(iTarget){

var oDiv = document.getElementById('div');

clearInterval(time);

time = setInterval(function(){

var speed = (iTarget-oDiv.offsetTop)/6;

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

if(oDiv.offsetTop == iTarget){

clearInterval(time)

}else{

oDiv.style.top = oDiv.offsetTop+speed+'px';

}

},30)

}