一、JavaScript代码：
代码
1 <script language="javascript">
2 var isIe=(document.all)?true:false;
3 //设置select的可见状态
4 function setSelectState(state)
5 {
6 var objl=document.getElementsByTagName('select');
7 for(var i=0;i<objl.length;i++){
8 objl[i].style.visibility=state;
9 }
10 }
11 function mousePosition(ev)
12 {
13 if(ev.pageX || ev.pageY){
14 return {x:ev.pageX, y:ev.pageY};
15 }
16 return{
17 x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,y:ev.clientY + document.body.scrollTop - document.body.clientTop
18 };
19 }
20 //弹出方法
21 function showMessageBox(ev,wTitle,content,wWidth,isShowClose)
22 {
23 if( confirm('Confirm to Continue (确认此操作)?') )
24 {
25 var pos = mousePosition(ev);
26 closeWindow();
27 var bWidth=parseInt(document.documentElement.scrollWidth);
28 var bHeight=parseInt(document.documentElement.scrollHeight);
29 if(isIe){
30 setSelectState('hidden');
31 }
32 var back=document.createElement("div");
33 back.id="back";
34 var styleStr="top:0px;left:0px;position:absolute;background:#666;"+bWidth+"px;height:"+bHeight+"px;";
35 styleStr+=(isIe)?"filter:alpha(opacity=30);":"opacity:30;";
36 back.style.cssText=styleStr;
37 document.body.appendChild(back);
38 showBackground(back,50);
39 var mesW=document.createElement("div");
40 mesW.id="mesWindow";
41
42 var html = "<div style='border-bottom: #eee 1px solid;margin-left: 4px;padding: 3px;font-weight: bold;text-align: left;font-size: 12px;'>";
43 html += "<table width='100%' height='100%'><tr><td>"+wTitle+"</td><td style='1px;'>";
44 if( isShowClose == 1 )
45 {
46 html += "<input type='button' onclick='closeWindow();' title='Close(关闭窗口)' style='height: 15px; 28px;border: none;cursor: pointer;text-decoration: underline;background: #fff;' value='关闭' />";
47 }
48 html += "</td></tr></table></div><div style='margin: 4px;font-size: 12px;padding:20px 0 20px 0;text-align:center' id='mesWindowContent'>"+content+"</div>";
49 mesW.innerHTML= html ;
50 var v_top=(document.body.clientHeight-mesW.clientHeight)/3;
51 v_top+=document.documentElement.scrollTop;
52
53 styleStr="border:#666 1px solid;background:#fff;top:"+v_top+"px;left:"+(document.body.clientWidth/2-mesW.clientWidth/2)+"px;position:absolute;600px;margin-left:-300px;left:50%;z-index:9999;";
54 mesW.style.cssText = styleStr;
55
56 document.body.appendChild(mesW);
57 return true;
58 }
59 else
60 return false;
61 }
62 //让背景渐渐变暗
63 function showBackground(obj,endInt)
64 {
65 if(isIe){
66 obj.filters.alpha.opacity+=5;
67 if(obj.filters.alpha.opacity<endInt){
68 setTimeout(function(){showBackground(obj,endInt)},1);
69 }
70 }else{
71 var al=parseFloat(obj.style.opacity);al+=0.05;
72 obj.style.opacity=al;
73 if(al<(endInt/100)){
74 setTimeout(function(){showBackground(obj,endInt)},1);
75 }
76 }
77 }
78 //关闭窗口
79 function closeWindow()
80 {
81 if(document.getElementById('back')!=null){
82 document.getElementById('back').parentNode.removeChild(document.getElementById('back'));
83 }
84 if(document.getElementById('mesWindow')!=null){
85 document.getElementById('mesWindow').parentNode.removeChild(document.getElementById('mesWindow'));
86 }
87 if(isIe){
88 setSelectState('');
89 }
90 }
91 </script>
二、使用实例：
Button1.Attributes.Add("onclick", "return showMessageBox(event,'友情提醒','数据提交中，请耐心等待',350,0);");