javascript调用rest地址，获取页面值

在用ArcGIS Server JavaScript开发中，经常遇到和其它平台对接或者调用SOE时，需要用js访问rest页面获得页面值，下面示例代码：

（注：此处是一个非常简单的示例，根据arcgis server页面的query操作，设置where="1=1"后构造的url，然后获取要素的示例）

<!DOCTYPE html> 
<html> 
<head> 
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
  <meta http-equiv="X-UA-Compatible" content="IE=7, IE=9, IE=10"> 
  
  <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"> 
  <title>JSON Content</title> 
  
 
  
  <script>var dojoConfig = { isDebug: true };</script> 
  <script src="http://serverapi.arcgisonline.com/jsapi/arcgis/3.5/"></script> 
  <script> 
      
     var url = "http://localhost:6080/arcgis/rest/services/testGetData/MapServer/0/query?where=1%3D1&text=&objectIds=&time=&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&relationParam=&outFields=&returnGeometry=true&maxAllowableOffset=&geometryPrecision=&outSR=&returnIdsOnly=false&returnCountOnly=false&orderByFields=&groupByFieldsForStatistics=&outStatistics=&returnZ=false&returnM=false&gdbVersion=&f=json";    
      var xmlHttp=GetXmlHttpObject();  
      function getContent()
      {
              xmlHttp.open("GET",url,true); //submit the URL request   
              xmlHttp.send(null);       
              xmlHttp.onreadystatechange= function() 
              {               
                    // Here we process the response   
                 var responseText=xmlHttp.responseText;             
                 alert(responseText);    
          
             }
      }    
      
       
      function GetXmlHttpObject() {  
        var xmlHttp=null;  
        try {  
        // Firefox, Opera 8.0+, Safari   
        xmlHttp=new XMLHttpRequest();  
        } catch (e) {  
        // Internet Explorer   
        try {  
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");  
        } catch (e) {  
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");  
        }  
        }  
        if (xmlHttp==null) {  
        alert ("Your browser does not support AJAX!");  
        return;  
        }  
        return xmlHttp;  
        }  
       
  </script> 
</head> 
  
<body style="font-family: Arial Unicode MS,Arial,sans-serif;"> 
  
  <p> 
    Enter URL here: <input type="text" disabled="true" id="url" size="75" /> 
    <input type="button" value="GO" onclick="getContent();" /> 
    <span id="status"></span> 
  </p> 
  <p> 
 
</body> 
</html> 
  