改善用户体验的alert提示效果

 1<input type="button" value="点击这里" onclick="sAlert('测试效果<br>还可以直接书写HTML代码 <br>© 2006');" />    
 2   
 3<script type="text/javascript" language="javascript">    
 4//Author:Daviv    
 5//Blog:http://blog.163.com/jxdawei    
 6//Date:2006-10-28    
 7//Email:jxdawei@gmail.com    
 8            function sAlert(str){    
 9            var msgw,msgh,bordercolor;    
10            msgw=400;//提示窗口的宽度    
11            msgh=100;//提示窗口的高度    
12            bordercolor="#336699";//提示窗口的边框颜色    
13            titlecolor="#99CCFF";//提示窗口的标题颜色    
14                
15            var sWidth,sHeight;    
16            sWidth=document.body.offsetWidth;    
17            sHeight=document.body.offsetHeight;    
18                
19   
20            var bgObj=document.createElement("div");    
21            bgObj.setAttribute('id','bgDiv');    
22            bgObj.style.position="absolute";    
23            bgObj.style.top="0";    
24            bgObj.style.background="#777";    
25            bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";    
26            bgObj.style.opacity="0.6";    
27            bgObj.style.left="0";    
28            bgObj.style.width=sWidth + "px";    
29            bgObj.style.height=sHeight + "px";    
30            document.body.appendChild(bgObj);    
31            var msgObj=document.createElement("div")    
32            msgObj.setAttribute("id","msgDiv");    
33            msgObj.setAttribute("align","center");    
34            msgObj.style.position="absolute";    
35            msgObj.style.background="white";    
36            msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";    
37            msgObj.style.border="1px solid " + bordercolor;    
38            msgObj.style.width=msgw + "px";    
39            msgObj.style.height=msgh + "px";    
40          msgObj.style.top=(document.documentElement.scrollTop + (sHeight-msgh)/2) + "px";    
41          msgObj.style.left=(sWidth-msgw)/2 + "px";    
42          var title=document.createElement("h4");    
43          title.setAttribute("id","msgTitle");    
44          title.setAttribute("align","right");    
45          title.style.margin="0";    
46          title.style.padding="3px";    
47          title.style.background=bordercolor;    
48          title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";    
49          title.style.opacity="0.75";    
50          title.style.border="1px solid " + bordercolor;    
51          title.style.height="18px";    
52          title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";    
53          title.style.color="white";    
54          title.style.cursor="pointer";    
55          title.innerHTML="关闭";    
56          title.onclick=function(){    
57            document.body.removeChild(bgObj);    
58        document.getElementById("msgDiv").removeChild(title);    
59        document.body.removeChild(msgObj);    
60        }    
61          document.body.appendChild(msgObj);    
62          document.getElementById("msgDiv").appendChild(title);    
63          var txt=document.createElement("p");    
64          txt.style.margin="1em 0"   
65          txt.setAttribute("id","msgTxt");    
66          txt.innerHTML=str;    
67      document.getElementById("msgDiv").appendChild(txt);    
68      }    
69        </script>   
70