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   var queryString = "firstName=" + firstName + "&lastName=" + lastName
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doRequestUsingGET() {   
         createXMLHttpRequest();   
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                           + new Date().getTime();   
         xmlHttp.onreadystatechange = handleStateChange;   
         xmlHttp.open("GET", url, true);   
         xmlHttp.send(null);   
}   
  
//POST·½Ê½Ìá½»   
function doRequestUsingPOST() {   
         createXMLHttpRequest();   
        var url = "GetAndPostExample?timeStamp=" + new Date().getTime();   
         xmlHttp.open("POST", url, true);   
         xmlHttp.onreadystatechange = handleStateChange;   
         xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");   
         xmlHttp.send(queryString);   
}  
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