JQuery Ajax请求

/***************************
 * Get JSON by SQL
 *
 * var tableName = "meta_guest_info";
 * var fields    = " DISTINCT META_TWO_CABIN_SERVICES_TICKET_LINK_ID as mainPKid";
 * var where     = "and (META_MEMBERSHIP_CARD_TYPE = '"+categoryID+"' OR META_JIESUANDANHAO = '"+jiesuandanhao+"')";
 * var param = "operFlag=getQueryDataJSON&tableName="+tableName+"&fields="+fields+"&where="+where;
 **************************/

function getJSONBySQL(param){
    param = encodeURI(param);
    var recordAry = null;
    $.ajax({
        type:'post',
        url:'/customize/control/DBSevices?'+param,
        async:false,      // 异步同步设置
        dataType:'json',  // 返回数据类型
        contentType: "application/x-www-form-urlencoded; charset=utf-8",
        success:function(returnValue){
            // Set search return data array
            recordAry = eval(returnValue);  // 放回值转换
        },
        error:function(XMLHttpRequest, textStatus, errorThrown){
            var errorInfo = "status:"+XMLHttpRequest.status;
            errorInfo+= ",readyState:"+XMLHttpRequest.readyState;
            Ext.Msg.alert("提示","槽糕!请求服务器端发生异常,请重新进行当前操作!{getJSONBySQL>error![errorInfo=<span style='color:red'>"+errorInfo+",<br>"+param+"</span>]}");
        }
    })
    return recordAry;
}