Ajax使用一+javascript解析Ajax返回的json字符串

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//关键：点击登录按钮后，Ajax方法判断，下面为login.php包含的login.js代码function chklg() {    if ($('lgname').value == '') {        alert('输入姓名');        $('lgname').focus();        return false;    }    if ($('lgchk').value != $('chknm').value) {        alert("验证码错误");        $('lgchk').focus();        return false;    }        //关键：Ajax获取user_login_chk.php数据    url = 'user_login_chk.php?act=' + (Math.random()) + '&name=' + $('lgname').value + '&pwd=' + $('lgpwd').value;    xmlhttp.open('get', url, true);    xmlhttp.send();    xmlhttp.onreadystatechange = function () {        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {            msg = xmlhttp.responseText;                        //关键：用eval将返回的json字符串msg转为json，并测试json,jsonobj.name            var jsonobj=eval('('+msg+')');

             //或者下面两句同样效果

           var jsonobj='';

           eval('jsonobj='+msg+';');

            alert(jsonobj.name);            $('name').innerHTML = jsonobj;            if (msg == '1') {                alert("登录成功");                location = "test.php"            }            else {                alert("登录失败");            }        }    }}

下面为user_login_chk.php代码

<?php//只是测试用session_start();header('Content-Type:text/html;charset=gb2312');include_once 'conn/conn.php';$name = $_GET['name'];$pwd = $_GET['pwd'];if(!empty($name) && !empty($pwd)){    $sql = "select name from tb_member where name = '".$name."'";    $num = $conne->getRowsNum($sql);    //$student为测试用的php数组，    $student = array("name"=>"lisheng","age"=>"35");    $studentJson = json_encode($student);    if($num == 0 || $num == '' ){        $reback = $studentJson;    }else{        $reback = $studentJson;    }}echo $reback;?>

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