document.onmousemove = function(ev){
var div = document.getElementById('div');
var scrollTop = document.documentElement.scrollTop||document.body.scrollTop;//滚动条距离网页顶部距离
oEven = ev||even;
div.style.left = oEven.clientX + 'px';//鼠标
div.style.top = oEven.clientY + scrollTop + 'px';//
}
