javascript异步调用XML进行解析的简单实现

虽然这种代码遍地都是，不过实际用的时候还是不那么得心应手，今天写了一个类似的应用，在此做个记录。

 1<script type="text/javascript">
 2    //
 3    function GetLiveScore() 
 4    {
 5      var xmldoc;
 6      if(window.ActiveXObject)
 7      {
 8          xmldoc=new ActiveXObject("Microsoft.XMLDOM");
 9      }
10      else if(document.implementation && document.implementation.createDocument)
11      {
12          xmldoc=document.implementation.createDocument("livescore","doc",null);
13      }
14      xmldoc.async=true;
15      xmldoc.load("../ScoreOdd/LiveScore.aspx");
16      xmldoc.onreadystatechange=function()
17      {
18         if (xmldoc.readyState == 4)
19         {
20            if(xmldoc==null) 
21            {
22                alert("error");
23            }
24            else
25            {
26                //
27              var match=xmldoc.getElementsByTagName('Match');          
28              if(match!=null && match.length>0)
29              {       
30                for(i=0;i<match.length;i++)
31                {
32                    var matchID=match[i].getAttribute("matchID");
33                    var score=match[i].getAttribute("score");
34                    var halfScore=match[i].getAttribute("halfScore");
35                    var matchTime=StringToDate(match[i].getAttribute("matchTime"));
36                    if(document.getElementById("Score"+matchID)!=null && document.getElementById("HalfScore"+matchID)!=null)
37                    {
38                        var now=new Date(); 
39                        //                                     
40                        if(now>matchTime)
41                        { 
42                            // 
43                            document.getElementById("Score"+matchID).innerText=score;
44                            //
45                            if(now>AddMinutes(matchTime,50))
46                            {
47                                //
48                                document.getElementById("HalfScore"+matchID).innerText=halfScore;
49                            }
52                        }
53                    }
54                 }
55               }
56            }
57          }
58       } 
59    }
60    //日期转换函数
61    function StringToDate(str)
62    {
63        var newDate=new Date();
64        var year=str.substring(0,4);
65        var month=str.substring(5,7)-1;
66        var day=str.substring(8,10);
67        var hour=str.substring(11,13);
68        var minute=str.substring(14,16);
69        newDate.setFullYear(year);        
70        newDate.setMonth(month);
71        newDate.setDate(day);
72        newDate.setHours(hour);
73        newDate.setMinutes(minute);
74        return newDate;
75    } 
76    //当前时间加上若干分钟后的时间
77    function AddMinutes(now,minute)
78    {
79        var newDate=new Date((now.getTime()+minute*60*1000));
80        return newDate;
81    }   
82    //window.setTimeout("GetLiveScore();",1000);
83    window.setInterval("GetLiveScore();",15000);
84    </script>

首先异步的从一个XML接口中读取数据，遍历DOM树，找到对应的值，并进行相应操作即可。