让div层随鼠标移动的实现代码 ie ff_javascript技巧

function IsIE() {
var OsObject = "";
if (navigator.userAgent.indexOf("MSIE") > 0) {
return true;
}
}
function mouseMove(ev) {
/*ie 与ff的event 机制不同*/
ev = ev || window.event;
var mousePos = mouseCoords(ev);
var detailDiv = document.getElementById("detailDiv"); //将要弹出的层
detailDiv.style.left = (mousePos.x + 10) + "px";
detailDiv.style.top = (mousePos.y + 18) + "px";
}
function mouseCoords(ev) {
if (ev.pageX || ev.pageY) {
return {
x: ev.pageX,
y: ev.pageY
};
}
/*ie 与 ff的边界 处理不同*/
if (IsIE()) {
return { x: ev.clientX + document.documentElement.scrollLeft - document.documentElement.clientLeft, y: ev.clientY + document.documentElement.scrollTop - document.documentElement.clientTop }
}
else {
return { x: ev.clientX + document.body.scrollLeft - document.body.clientLeft, y: ev.clientY + document.body.scrollTop - document.body.clientTop }
}
}
document.onkeydown = keydown;