<!doctype html>

<html>

<head>

<meta charset="utf-8">

<style>

#div1{

    height:200px;

    width:100px;

    border:1px #999999 solid;

    display:none;

    }

</style>

<title>无标题文档</title>

<script type="text/javascript">

    window.onload = function ()

    {

        var obtn = document.getElementById('btn');

        var odiv = document.getElementById('div1');

        obtn.onclick = function (ev)

        {

            var ev = ev || event;

            ev.cancelBubble = true;

            odiv.style.display = 'block';

        }

        document.onclick = function ()

        {

            odiv.style.display = 'none';

        }

    };

</script>

</head>

<body>

<input type="button" id="btn" value="确认">

<div id="div1"></div>

<p>1111111111</p>

</body>

</html>