问Ajax: php部件需要在一个函数中使用引号，但在另一个函数中不需要引号

EN

function insertMemberActivities()
{
    var data = "memId=" + <?php echo $_SESSION['memberId'];?> + "&acts=" + <?php echo $_GET['actID'] ;?> + "&comments=" + document.getElementById('comments').value;

    $.ajax({
        dataType: 'json',
        url: 'json-responses.php?fct=insertMemberActivities',
        data: data,
        cache: false,
        success: sendMailToMember(),
        // error: myCallbackError
    });
};

function sendMailToMember()
{
    var data = "eventName=" + "<?php echo $_GET['eventName'];?>" +
               "&userEmail=" + "<?php echo $_SESSION['user'] ;?>" + 
               "&first=" + "<?php echo $_SESSION['first']; ?>" + 
               "&last=" + "<?php echo $_SESSION['last']; ?>";

    $.ajax({
        dataType: 'json',
        url: 'stcg-json-responses.php?fct=emailSendToVolunteer',
        data: data,
        cache: false
    });
}