ajaxFileUpload插件上传文件 返回 syntaxError :unexpected token

Html 代码
<table id="deploy_application" class="bordered-table">  
  <tr>  
    <td id="application_file">  
      <input id="file_field" type="file" name="application" size="20" />  
    </td>  
    <td id="application_submit">  
      <input id="submit_button" type="submit" value="Upload" onclick="uploadFile()" />  
    </td>  
  </tr>  
</table>  

　　JS代码

function ajaxFileUpload() {	
  $.ajaxFileUpload
    (
      {
        url: '/upload',
        secureuri: false,
        fileElementId: 'file_field',
        dataType: 'json', //这里选择了json
			
        success: function (data, status) {
          alert(data);
        },
				
        error: function (data, status, e) {
           alert(e);
        }
      }
    )
}

　

　　修改后的JS

function ajaxFileUpload() {
	
  $.ajaxFileUpload
    (
      {
        url: '/upload',
        secureuri: false,
        fileElementId: 'file_field',
        dataType: 'content', //这里修改为content
			
        success: function (data, status) {
          alert(data);
        },
				
        error: function (data, status, e) {
           alert(e);
        }
      }
    )
}

　　结果返回的json数据如猜测，json数据被包含在一个<pre></pre>的标签中，如下图： 

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" ) {
             ////////////以下为新增代码///////////////
             data = r.responseText;
             var start = data.indexOf(">");
             if(start != -1) {
        	   var end = data.indexOf("<", start + 1);
        	   if(end != -1) {
        	     data = data.substring(start + 1, end);
        	    }
             }
              ///////////以上为新增代码///////////////
              eval( "data = " + data);
        }
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();

        return data;
    }

　　完整的JS见附件：下载