不随滚动条的弹窗
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{ margin:0; padding:0;}
#login{ 300px; height:300px; border:1px #000 solid; position:absolute;}
#close{ position:absolute; right:0; top:0;}
</style>
<script type="text/javascript" src="jquery-1.10.1.min.js"></script>
<script>
$(function(){
//var oDiv = $('<div>div</div>');
//$('body').append( oDiv );
$('#input1').click(function(){
var oLogin = $('<div id="login"><p>用户名:<input type="text" /></p><p>密码:<input type="text" /></p><div id="close">X</div></div>');
$('body').append( oLogin );
oLogin.css('left' , ($(window).width() - oLogin.outerWidth())/2 );
oLogin.css('top' , ($(window).height() - oLogin.outerHeight())/2 );
$('#close').click(function(){
oLogin.remove();
});
$(window).on('resize scroll',function(){
//oLogin.css('left' , ($(window).width() - oLogin.outerWidth())/2 );//左右居中的写法,$(window).width()是可视区宽度；
// oLogin.css('top' , ($(window).height() - oLogin.outerHeight())/2 + $(window).scrollTop() );//上下居中
oLogin.css('left' , 500px );
oLogin.css('top' , oLogin.outerHeight()+ $(window).scrollTop() );
}); }); }); </script> </head> <body style="height:2000px;"> <input type="button" value="点击" id="input1" /> <!--<div id="login"> <p>用户名:<input type="text" /></p> <p>密码:<input type="text" /></p> <div id="close">X</div> </div>--> </body> </html>