我在使用 ajax 將事件從 javascript 添加到 php 時遇到問題。session_start();include "objects.php";include "db.php";$userId = $_SESSION['userId'];$userName = $_SESSION['username'];$html = '<h2 class="peopleHeader divSubContainer" id="peopleFriendsHeader" data-id ="peopleFriendsHeader"     data-target="peopleFriends" style="cursor:pointer" onclick=hideShowh2(this.getAttribute("data-id"),this.getAttribute("data-target"))>    Friends <button id="refreshButton"><i class="fa fa-refresh" style="font-size:24px"></i></button></h2>';    $html .= '<ul class="peopleFriends" id="peopleFriends">';$query = "select * from user_status where userId = " . $userId;$selectingData = new selectingData($query, $conn);$result = $selectingData->getResult();if (count(json_decode($result[0]['friends'])) > 0) {    foreach ($result as $r) {        $allFriends = json_decode(strtolower(stripslashes($r['friends'])));        foreach ($allFriends as $r2) {            $query = 'select * from chatsystemuser where userName ="' . $r2 . '"';            $selectingData = new selectingData($query, $conn);            $result = $selectingData->getResult();            foreach ($result as $r) {                $html .= "<li><p>" . $r2 . "</p><button data-target-user= '".$r['id']."' id='friendsMessageButton" . $r['id'] . "' class='btn friendsMessageButton'>MESSAGE                    </button></li>";            }        }    }} else {    $html .= "<h2> NO FRIENDS </h2>";}$html .= "</ul>";echo $html;這是我的 javascript ajax，可以顯示給瀏覽器。function displayingFriends() {    var friends = $('.listOfFriends');    $.ajax({        url: "include/friends.php",        type: 'post',        datatype: 'html',        success: function (data) {            friends.html(data);        }    })}我想使用數(shù)據(jù)屬性選擇所有按鈕。對不起，我的英語不好，我不太擅長用英語交談，但我能很好地理解它。