他都不知道你lggood和bgDIV是啥，你要加一段JS指定才能：还有，你代码中没有bgDIV标签
这句要改成：
<span class="t2" title="关闭" onClick="lggood.style.display='none'">X</span>
<script>
var lggood=document.getElementsByClassName("lggood")[0]
</script>
上代码：<!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>
<title>JS+CSS实现可最小化/关闭的右下角浮动窗口</title>
<style type="text/css">
#msg_win{position:absoluteright:0pxdisplay:noneoverflow:hiddenz-index:99border:1px solid #c00background:#F9EFFCwidth:240pxfont-size:12pxmargin:0px}
#msg_win .icos{position:absolutetop:2px*top:0pxright:2pxz-index:9}
.icos a{float:leftcolor:#FFFFFFmargin:1pxtext-align:centerfont-weight:boldwidth:14pxheight:22pxline-height:22pxpadding:1pxtext-decoration:nonefont-family:webdings}
.icos a:hover{color:#FFCC00}
#msg_title{background:#AC19E3border-bottom:1px solid #710B97border-top:1px solid #FFFborder-left:1px solid #FFFcolor:#FFFFFFheight:25pxline-height:25pxtext-indent:5pxfont-weight:bold}
#msg_content{margin:5pxmargin-right:0width:230pxheight:126pxoverflow:hidden}
</style>
</head>
<body>
<div style="height:2000px"></div>
<div id="msg_win" style="display:blocktop:503pxvisibility:visibleopacity:1">
<div class="icos"><a id="msg_min" title="最小化" href="javascript:void 0">_</a><a id="msg_close" title="关闭" href="javascript:void 0">×</a></div>
<div id="msg_title">浮动窗口标题：</div>
<div id="msg_content">浮动窗口内容：欢迎提出宝贵意见，谢谢！</div>
</div>
<script language="javascript">
var Message={
set: function() {//最小化与恢复状态切换
var set=this.minbtn.status == 1?[0,1,'block',this.char[0],'最小化']:[1,0,'none',this.char[1],'恢复']
this.minbtn.status=set[0]
this.win.style.borderBottomWidth=set[1]
this.content.style.display =set[2]
this.minbtn.innerHTML =set[3]
this.minbtn.title = set[4]
this.win.style.top = this.getY().top
},
close: function() {//关闭
this.win.style.display = 'none'
window.onscroll = null
},
setOpacity: function(x) {//设置透明度
var v = x >= 100 ? '': 'Alpha(opacity=' + x + ')'
this.win.style.visibility = x<=0?'hidden':'visible'//IE有绝对或相对定位内容不随父透明度变化的bug
this.win.style.filter = v
this.win.style.opacity = x / 100
},
show: function() {//渐显
clearInterval(this.timer2)
var me = this,fx = this.fx(0, 100, 0.1),t = 0
this.timer2 = setInterval(function() {
t = fx()
me.setOpacity(t[0])
if (t[1] == 0) {clearInterval(me.timer2) }
},6)//10 to 6
},
fx: function(a, b, c) {//缓冲计算
var cMath = Math[(a - b) >0 ? "floor": "ceil"],c = c || 0.1
return function() {return [a += cMath((b - a) * c), a - b]}
},
getY: function() {//计算移动坐标
var d = document,b = document.body, e = document.documentElement
var s = Math.max(b.scrollTop, e.scrollTop)
var h = /BackCompat/i.test(document.compatMode)?b.clientHeight:e.clientHeight
var h2 = this.win.offsetHeight
return {foot: s + h + h2 + 2+'px',top: s + h - h2 - 2+'px'}
},
moveTo: function(y) {//移动动画
clearInterval(this.timer)
var me = this,a = parseInt(this.win.style.top)||0
var fx = this.fx(a, parseInt(y))
var t = 0
this.timer = setInterval(function() {
t = fx()
me.win.style.top = t[0]+'px'
if (t[1] == 0) {
clearInterval(me.timer)
me.bind()
}
},6)//10 to 6
},
bind:function (){//绑定窗口滚动条与大小变化事件
var me=this,st,rt
window.onscroll = function() {
clearTimeout(st)
clearTimeout(me.timer2)
me.setOpacity(0)
st = setTimeout(function() {
me.win.style.top = me.getY().top
me.show()
},100)//600 mod 100
}
window.onresize = function (){
clearTimeout(rt)
rt = setTimeout(function() {me.win.style.top = me.getY().top},100)
}
},
init: function() {//创建HTML
function $(id) {return document.getElementById(id)}
this.win=$('msg_win')
var set={minbtn: 'msg_min',closebtn: 'msg_close',title: 'msg_title',content: 'msg_content'}
for (var Id in set) {this[Id] = $(set[Id])}
var me = this
this.minbtn.onclick = function() {me.set()this.blur()}
this.closebtn.onclick = function() {me.close()}
this.char=navigator.userAgent.toLowerCase().indexOf('firefox')+1?['_','::','×']:['0','2','r']//FF不支持webdings字体
this.minbtn.innerHTML=this.char[0]
this.closebtn.innerHTML=this.char[2]
setTimeout(function() {//初始化最先位置
me.win.style.display = 'block'
me.win.style.top = me.getY().foot
me.moveTo(me.getY().top)
},0)
return this
}
}
Message.init()
</script>
</body>
</html>
<br><br><hr>收集于互联网，只为兴趣与学习交流，不作商业用途。</font></p>
栗如窗口最外层class名为 closed 则这么写 $(document).ready(function(){ $('.closed').click(function(){$(this).hide()})})记得头部引入 jQuery库
