帮忙看看改写的AJAX有什么东东没

2013-11-20

帮忙看看改写的AJAX有什么错误没?之前用的html的FORM提交用sumbit的那种，现在改写为ajax，，貌似不对/scrip

帮忙看看改写的AJAX有什么错误没?
之前用的html的FORM提交用sumbit的那种，现在改写为ajax，，貌似不对

</script>

</script>
<script type="text/javascript">
function loadXMLDoc()
{
xmlhttp=null;
   if (window.XMLHttpRequest)
   {// code for Firefox, Mozilla, IE7, etc.
     xmlhttp=new XMLHttpRequest();
   }
   else if (window.ActiveXObject)
   {// code for IE6, IE5
     xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
   if (xmlhttp!=null)
   {
     xmlhttp.onreadystatechange=state_Change;
     xmlhttp.open("GET","iocontrol3.cgi",true);
     xmlhttp.send(null);
     setTimeout("loadXMLDoc()",1000);
   }
   else
   {
     alert("Your browser does not support XMLHTTP.");
   }
}

function state_Change()
{
if (xmlhttp.readyState==4)
  {// 4 = "loaded"
  if (xmlhttp.status==200)
    {// 200 = "OK"

      str = xmlhttp.responseText;
      canshu = str.split(";");
    document.getElementById('port1').innerHTML=canshu;
    document.getElementById('port2').innerHTML=canshu;
    document.getElementById('port3').innerHTML=canshu;
    }
  else
    {
    alert("Problem retrieving data:" + xmlhttp.statusText);
    }
  }
}
}
</script>
</head>

<body>
<script type='text/javascript' language='JavaScript'>
//
</script>

<form method="get" action="iocontrol3.cgi" name="iocontrol3">
<table border="1">
<b><font size="5"> Form3 Control</font>
<tr>
<td>PORT1<br>
<select name="port1" >
<option value="0">OFF
<option value="1">ON
</select>
</td>

<td>PORT2<br>
<select name="port2">
<option value="0">OFF
<option value="1">ON
</select>
</td>
<td>PORT3<br>
<select name="port3">
<option value="0">OFF
<option value="1">ON
</select>
</td>
<td><br>
<input type="button" onclick="loadXMLDoc()" name=WM value="submit">
</td>
</tr>
</table>
<br>
</form>
</body>

</html>
[解决办法]
你提交，数据没有写在后面啊
xmlhttp.open("GET","iocontrol3.cgi?port3=xxx&port1=xxxx",true);
[解决办法]
你的xmlHttp变量不一致，一改设一个全局变量，或者将xmlHttp传到 state_Change()方法中

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帮忙看看改写的AJAX有什么东东没