延时提示框鼠标移入显示移出隐藏下拉提示

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
div {float:left; margin:10px;}
#div1 {width:50px; height:50px; background:red;}
#div2 {width:250px; height:180px; background:#CCC; display:none;}
</style>
<script>
window.onload=function ()
{
    var oDiv1=document.getElementById('div1');
    var oDiv2=document.getElementById('div2');
    var timer=null;
    
    oDiv2.onmouseover=oDiv1.onmouseover=function ()
    {
        clearTimeout(timer);
        oDiv2.style.display='block';
    };
    oDiv2.onmouseout=oDiv1.onmouseout=function ()
    {
        timer=setTimeout(function (){
            oDiv2.style.display='none';
        }, 500);
    };
};
</script>
</head>

<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>

延时提示框 鼠标移入显示移出隐藏 下拉提示

延时提示框鼠标移入显示移出隐藏下拉提示