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AJAX 常用函數
編輯:AJAX詳解     

創建XMLHTTP對象,區別IE,Mozilla浏覽器
   [復制此代碼]CODE: function getRequest() {  
        http_request = false;  
        if (window.XMLHttpRequest) {   
            //對於Mozilla﹑Netscape﹑Safari等浏覽器,創建XMLHttpRequest   
            http_request = new XMLHttpRequest();  
            if (http_request.overrideMimeType) {  
                 //如果服務器響應的header不是text/XML,可以調用其它方法修改該header  
                http_request.overrideMimeType('text/XML');  
            }  
        } else if (window.ActiveXObject) {   
  // 對於Internet Explorer浏覽器,創建XMLHttpRequest   
            try {  
                http_request = new ActiveXObject("Msxml2.XMLHTTP");  
            } catch (e) {  
                try {  
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");  
                } catch (e) {}  
            }  
        }  
  return http_request;  
 } //獲得Url 的responseText

[復制此代碼]CODE: function getResponseText(url)  
 {  
  http_request=getRequest();  
        http_request.open('GET', url, false);  
        http_request.send(null);  
  if (http_request.readyState == 4)   
    {  
     // 收到完整的服務器響應   
     if (http_request.status == 200) {  
      //HTTP服務器響應的值OK  
      requestdoc = http_request.responseText;   
      //將服務器返回的字符串寫到頁面中ID為message的區域   
    }   
      else {  
      requestdoc = http_request.status;  
      }  
    }  
  return requestdoc;  
 } //獲得Url 的responseXML
 [復制此代碼]CODE:function getResponseText(url)  
 {  
  http_request=getRequest();  
        http_request.open('GET', url, false);  
        http_request.send(null);  
  if (http_request.readyState == 4)   
    {  
     // 收到完整的服務器響應   
     if (http_request.status == 200) {  
      //HTTP服務器響應的值OK  
      requestdoc = http_request.responseXML;   
      //將服務器返回的字符串寫到頁面中ID為message的區域   
    }   
      else {  
      requestdoc = http_request.status;  
      }  
    }  
  return requestdoc;  
 }

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