页面设置弹窗，点击其他区域，弹窗关闭

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <title>test</title>
    <script src="plugins/jquery-2.0.0.min.js"></script>
    <script>
        $(function(){
            $(‘#btn‘).click(function(){
                $(‘#box‘).css(‘display‘,‘block‘);
            });

            $(document).on(‘mousedown‘,function(e){
                if(!$(e.target).is($(‘#btn‘)) && !$(e.target).is($(‘#box‘)) && $(e.target).parent(‘#box‘).length === 0){
                    $(‘#box‘).css(‘display‘,‘none‘);
                }
            });
        });
    </script>

</head>
<body>
<button id="btn">显示</button>
<div style="display:none; width:200px; height:200px; " id="box">
    <div>内层的文字</div>
</div>
</body>

</html>