<script type="text/javascript">$(#buttonUplod).click(function () { $.ajaxFileUpload ({  url:'doajaxfileupload.php', //你處理上傳文件的服務端  secureuri:false, //與頁面處理代碼中file相對應的ID值  fileElementId:'img',  dataType: 'json', //返回數據類型:text，xml，json，html,scritp,jsonp五種  success: function (data) {   alert(data.file_infor);  } })});</script><input id="img" type="file" size="45" name="img" ><button id="buttonUpload" onclick="return ajaxFileUpload();">Upload</button> 

<?php $upFilePath = "../attachment/";$ok=@move_uploaded_file($_FILES['img']['tmp_name'],$upFilePath); if($ok === FALSE){  echo json_encode('file_infor'=>'上傳失敗'); }else{  echo json_encode('file_infor'=>'上傳成功'); }?> 

addOtherRequestsToForm: function(form,data){ // add extra parameter var originalElement = $('<input type="hidden" name="" value="">'); for (var key in data) {  name = key;  value = data[key];  var cloneElement = originalElement.clone();cloneElement.attr({'name':name,'value':value});  $(cloneElement).appendTo(form); } return form;}, ajaxFileUpload: function(s) { // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout   s = jQuery.extend({}, jQuery.ajaxSettings, s); var id = new Date().getTime()     var form = jQuery.createUploadForm(id, s.fileElementId); if ( s.data ) form = jQuery.addOtherRequestsToForm(form,s.data); var io = jQuery.createUploadIframe(id, s.secureuri); 

array_push($_FILES,$_REQUEST);$file_info = var_export($_FILES,true);$ok = file_put_contents("../attachment/file_info.txt",$file_info);if ($ok) exit(json_encode('file_infor'=>'上傳成功'));exit (json_encode('file_infor'=>'上傳失敗')); 

jQuery.extend({  createUploadIframe: function(id, uri) {  //create framevar frameId = 'jUploadFrame' + id;if(window.ActiveXObject) {var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');if(typeof uri== 'boolean'){io.src = 'javascript:false';}else if(typeof uri== 'string'){io.src = uri;}}else {var io = document.createElement('iframe');io.id = frameId;io.name = frameId;}io.style.position = 'absolute';io.style.top = '-1000px';io.style.left = '-1000px'; document.body.appendChild(io); return io    },  createUploadForm: function(id, fileElementId) { //create form  var formId = 'jUploadForm' + id; var fileId = 'jUploadFile' + id; var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');  var oldElement = $('#' + fileElementId); var newElement = $(oldElement).clone(); $(oldElement).attr('id', fileId); $(oldElement).before(newElement); $(oldElement).appendTo(form); //set attributes $(form).css('position', 'absolute'); $(form).css('top', '-1200px'); $(form).css('left', '-1200px'); $(form).appendTo('body');  return form;  }, addOtherRequestsToForm: function(form,data) { // add extra parameter var originalElement = $('<input type="hidden" name="" value="">'); for (var key in data) {  name = key;  value = data[key];  var cloneElement = originalElement.clone();  cloneElement.attr({'name':name,'value':value});  $(cloneElement).appendTo(form); } return form; },   ajaxFileUpload: function(s) {    // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout     s = jQuery.extend({}, jQuery.ajaxSettings, s);    var id = new Date().getTime()     var form = jQuery.createUploadForm(id, s.fileElementId); if ( s.data ) form = jQuery.addOtherRequestsToForm(form,s.data); var io = jQuery.createUploadIframe(id, s.secureuri); var frameId = 'jUploadFrame' + id; var formId = 'jUploadForm' + id;     // Watch for a new set of requests    if ( s.global && ! jQuery.active++ ) {  jQuery.event.trigger( "ajaxStart" ); }          var requestDone = false;    // Create the request object    var xml = {}     if ( s.global )jQuery.event.trigger("ajaxSend", [xml, s]);    // Wait for a response to come back    var uploadCallback = function(isTimeout) {    var io = document.getElementById(frameId);try  {    if(io.contentWindow)  {   xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null; xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;  }else if(io.contentDocument)  {   xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null; xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;  }   }catch(e)  {  jQuery.handleError(s, xml, null, e);  }if ( xml || isTimeout == "timeout")  {  requestDone = true;var status;try {status = isTimeout != "timeout" ? "success" : "error";// Make sure that the request was successful or notmodifiedif ( status != "error" )   {// process the data (runs the xml through httpData regardless of callback)var data = jQuery.uploadHttpData( xml, s.dataType );  // If a local callback was specified, fire it and pass it the dataif ( s.success )s.success( data, status );// Fire the global callbackif( s.global )jQuery.event.trigger( "ajaxSuccess", [xml, s] );} elsejQuery.handleError(s, xml, status);} catch(e)  {status = "error";jQuery.handleError(s, xml, status, e);} // The request was completedif( s.global )jQuery.event.trigger( "ajaxComplete", [xml, s] ); // Handle the global AJAX counterif ( s.global && ! --jQuery.active )jQuery.event.trigger( "ajaxStop" ); // Process resultif ( s.complete )s.complete(xml, status); jQuery(io).unbind() setTimeout(function()     { try     {      $(io).remove();      $(form).remove();      } catch(e)     {      jQuery.handleError(s, xml, null, e);     }          }, 100) xml = null }    }    // Timeout checker    if ( s.timeout > 0 ) {setTimeout(function(){// Check to see if the request is still happeningif( !requestDone ) uploadCallback( "timeout" );}, s.timeout);    }    try {      // var io = $('#' + frameId);  var form = $('#' + formId);  $(form).attr('action', s.url);  $(form).attr('method', 'POST');  $(form).attr('target', frameId);if(form.encoding)  {form.encoding = 'multipart/form-data';  }else  {  form.enctype = 'multipart/form-data';}  $(form).submit();     } catch(e) {  jQuery.handleError(s, xml, null, e);    }if(window.attachEvent){document.getElementById(frameId).attachEvent('onload', uploadCallback);    }    else{document.getElementById(frameId).addEventListener('load', uploadCallback, false);    }      return {abort: function () {}};   },   uploadHttpData: function( r, type ) {    var data = !type;    data = type == "xml" || data ? r.responseXML : r.responseText;    // If the type is "script", eval it in global context    if ( type == "script" )jQuery.globalEval( data );    // Get the JavaScript object, if JSON is used.    if ( type == "json" )eval( "data = " + data );    // evaluate scripts within html    if ( type == "html" )jQuery("<div>").html(data).evalScripts();  //alert($('param', data).each(function(){alert($(this).attr('value'));}));    return data;  }})