ajax处理php返回json数据例子

/-***-------test.html---------------/
click

function ajax_init()
{
    var ajax=false;
    try {
        ajax = new ActiveXObject("Ms***2.XMLHTTP");
    } catch (e) {
        try {
            ajax = new ActiveXObject("Mi***soft.XMLHTTP");
        } catch (E) {
            ajax = false;
        }
    }
    if (!ajax && typeof XMLHttpRequest!='undefined') {
        ajax = new XMLHttpRequest();
    }
    return ajax;
}
function post_data()
{
    var url = "/s***er/xml.php";

    var show_check = do***ent.getElementById("show_check");
    var show_flag = do***ent.getElementById("show_flag");

    var ajax = ajax_init();
    aj***open("GET", url, true);

    //var img = "";
    aj***onreadystatechange = function()
    {
        if (aj***readyState == 4 && aj***status == 200)
        {
        var ret = aj***responseText;
            var show_info = eval(ret);
            sh***check.innerHTML = show_info[0].no1; // bsd
            sh***flag.innerHTML = show_info[0].no2; // wuddy
            //alert("responseXML's value: " + info[0].f***tChild.data);   
        }
       /*else
       {
          sh***innerHTML = img;
       }*/
    }
    aj***send(null);
}

/****---------json.php-----------------*/
   /* 这边如果写成     $info = array('no1'=>'bsd', 'no2'=>'wuddy', 'no3'=>'xie'); */
   /* 同样要把html文件中必成     var show_info = eval('[' + ret + ']'); 都是返回一个对象 */
    $info = array(array('no1'=>'bsd', 'no2'=>'wuddy', 'no3'=>'xie'));
    $userinfo = json_encode($info);
    echo $userinfo;
?>