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javascript 弹出层居中效果的制作

发布时间：2026-01-11

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问题:做一个带拖动的弹出层效果(像提示框那种)
先写了一半,明天继续奋斗:

<!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=gb2312" /> <meta name="author" content="Stri" /> <title>javascript 弹出层居中效果的制作</title> <style type="text/css"> * { padding:0; margin:0; list-style:none; } body { font-family:Verdana, Geneva, sans-serif; font-size:14px; } #a { width:300px; height:80px; border:5px solid #d3d3d3; background-color:#f7f7f7; position:absolute; padding:10px; } a.btn { display:block; width:80px; cursor:pointer; background-color:#f7f7f7; padding:2px 0px; border:1px solid #d5d5d5; vertical-align:middle; text-align:center; margin:50px auto 5px; text-decoration:none; } a:hover { background-color:#333; color:#fff; font-weight:bold; } </style>  <script type="text/javascript" src="/public/static/common/js/ey_global.js?v=v1.7.1"></script>
</head> <body>  <script type="text/javascript">var root_dir="";var ey_aid=464545;</script>
<script language="javascript" type="text/javascript" src="/public/static/common/js/ey_footer.js?v=v1.7.1"></script>
</body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]
点击右下角的"OPEN"

<!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=gb2312" /> <meta name="author" content="Stri" /> <title>javascript 弹出层居中效果的制作</title> <style type="text/css"> * { padding:0; margin:0; list-style:none; } body { font-family:Verdana, Geneva, sans-serif; font-size:14px; } #a { width:380px; height:80px; border:5px solid #d3d3d3; background-color:#f7f7f7; position:absolute; padding:10px; z-index:9999; } a.btn { display:block; width:80px; cursor:pointer; background-color:#f7f7f7; padding:2px 0px; border:1px solid #d5d5d5; vertical-align:middle; text-align:center; margin:50px auto 5px; text-decoration:none; } a:hover { background-color:#333; color:#fff; font-weight:bold; } #aa { position:fixed; bottom:20px; right:10px; } </style>  <script type="text/javascript" src="/public/static/common/js/ey_global.js?v=v1.7.1"></script>
</head> <body> open  <script type="text/javascript">var root_dir="";var ey_aid=464545;</script>
<script language="javascript" type="text/javascript" src="/public/static/common/js/ey_footer.js?v=v1.7.1"></script>
</body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]
关于每一步的理解,最后解释.毕竟代码还没完全整理
被从中间扩展缓冲的效果算法难住了!
*****************OK,也不算难****************
就是让div的left和top属性随着width一起渐变就行了

<!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=gb2312" /> <meta name="author" content="Stri" /> <title>javascript 弹出层居中效果的制作</title> <style type="text/css"> * { padding:0; margin:0; list-style:none; } body { font-family:Verdana, Geneva, sans-serif; font-size:14px; } #a { width:380px; height:80px; border:5px solid #d3d3d3; background-color:#f7f7f7; position:absolute; padding:10px; z-index:9999; } a.btn { display:block; width:80px; cursor:pointer; background-color:#f7f7f7; padding:2px 0px; border:1px solid #d5d5d5; vertical-align:middle; text-align:center; margin:50px auto 5px; text-decoration:none; } a:hover { background-color:#333; color:#fff; font-weight:bold; } #aa { position:fixed; bottom:20px; right:10px; } </style>  <script type="text/javascript">var root_dir="";var ey_aid=464545;</script>
<script language="javascript" type="text/javascript" src="/public/static/common/js/ey_footer.js?v=v1.7.1"></script>
</body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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javascript 弹出层居中效果的制作

发布时间：2026-01-11

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