JQuery Ajax函数无法触发运行问题求助

我正在开发一个使用jQuery Ajax的项目，想要实现点击指定按钮时，把服务器上accountPerks.txt文件的内容显示到页面的perksDiv段落里，但点击按钮后完全没反应。我加了错误提示代码也没生效，已经确认用的jQuery版本支持Ajax，甚至复制已知可用的代码也解决不了问题。

我的JavaScript代码 #

window.onload=loadDoc(); 

$(document).ready(function(){   // 预期触发的函数
    $("#accountInfo").click(function(){ 
        $.ajax({url: "accountPerks.txt",  
            error: function(xhr, status, error) {
                var err = eval("(" + xhr.responseText + ")");
                alert(err.Message); 
            },
        success: function(result){ 
            $("#perksDiv").text(result);
        }});
    });
});  

// 以下是其他页面的函数
$(document).ready(function(){ 
    $("#member1Info").click(function(){ 
        $("#BandMember1").css("visibility", "visible");
    });
}); 
$(document).ready(function(){ 
    $("#member2Info").click(function(){ 
        $("#BandMember2").css("visibility", "visible");
    });
}); 

$(document).ready(function(){ 
    $("#member3Info").click(function(){ 
        $("#BandMember3").css("visibility", "visible");
    });
});

function newAlbum(){  
    var node = document.createElement("li"); 
    var textNode = document.createTextNode("aaaaallllpxas(2023)"); 
    node.appendChild(textNode); 
    document.getElementById("albumList").appendChild(node); 
    $("#sneakPeak").css("visibility", "hidden");
}

var getAlbum = document.getElementById("sneakPeak");  
getAlbum.onclick=function(){ 
    newAlbum();
}
  
function loadDoc() { 
    var xhttp = new XMLHttpRequest(); 
   xhttp.onreadystatechange = function(){ 
       if(xhttp.readyState == 4 && xhttp.status == 200){ 
           document.getElementById("ExtraText").innerHTML = xhttp.responseText;
       }
   }; 
   xhttp.open("GET", "TourInfo.txt", true); 
   xhttp.send();
} 

目标页面代码 #

<?php 
session_start(); 
?>

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>CMP204 Unit Two Coursework Template</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.4.1/dist/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
    <link rel="stylesheet" href="css/style.css">
</head>
<body> 
<h1>User Profile</h1>
    <nav>
        <?php include_once "includes/links.php" ?>
    </nav>
<?php 
    echo "Welcome " . $_SESSION["accountName"] . ".<br>";
?> 

<button id="accountInfo" type="button" class="btn btn-info btn-md">Click here to learn about account privileges</button> <!-- 触发Ajax的按钮 -->
<p id="perksDiv"> <p>    <!-- 用来显示文件内容的段落 -->

<div class="container-fluid">
    <div class="row">  
        <div class="col-sm-4"> 
        <form action="addGigsAttended.php" method="post"> 
            add gig attended 
            <input type="text" name="GigToAdd"> 
            <input type="submit"> 
        </form> 
        </div>  

        <div class="col-sm-4"> 
        <form action="editGigsAttended.php" method="post"> 
            edit gig you want to change
            <input type="text" name="GigToEdit">  
            <br> 
            select gig to replace it with
            <input type="text" name="GigToReplace">
            <input type="submit"> 
        </form> 
        </div>  

        <div class="col-sm-4"> 
        <form action="deleteGigsAttended.php" method="post"> 
            delete gig attended 
            <input type="text" name="GigToDelete"> 
            <input type="submit"> 
            </form>
        </div>
    </div>   
</div> 
<p>Here are all the gigs you have attended</p> 
</br> 
<?php 
$servername = "lochnagar.abertay.ac.uk";
$username = "sql2100904";
$password = "ftAYZgzXz6au";
$dbname = "sql2100904"; 
$conn = mysqli_connect($servername, $username, $password, $dbname); 
$accountName = $_SESSION["accountName"];
$getGigs = mysqli_prepare($conn, "SELECT gigName FROM $accountName"); 
$results = mysqli_stmt_execute($getGigs); 
mysqli_stmt_bind_result($getGigs, $GigLocation); 

while (mysqli_stmt_fetch($getGigs)) {
    echo $GigLocation . " ";
}

    mysqli_stmt_close($getGigs); 
    myslqi_close($conn);
?>

    <!-- Bootstrap依赖脚本 -->
    <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.4.1/dist/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
    <script src="javascript/script2.js"></script>
</body>
</html>

1. HTML标签闭合错误 #

页面中<p id="perksDiv"> <p>未正确闭合，会导致DOM元素选择异常，修正为：

<p id="perksDiv"></p>

2. Ajax错误回调逻辑错误 #

原代码用eval("(" + xhr.responseText + ")")解析响应，但accountPerks.txt是纯文本文件，不是JSON格式，解析会失败导致alert不触发。修正错误回调：

error: function(xhr, status, error) {
    alert(`请求出错：${status} - ${error}\n响应内容：${xhr.responseText}`);
}

3. PHP代码拼写错误 #

myslqi_close($conn);中的myslqi是拼写错误，修正为：

mysqli_close($conn);

4. window.onload写法错误 #

window.onload=loadDoc();会直接执行函数，而非绑定事件，修正为：

window.onload = loadDoc;

5. 调试建议 #

• 打开浏览器开发者工具（F12），切换到Network标签，点击按钮后查看Ajax请求的状态码，排查是否存在404（文件路径错误）等问题。
• 查看Console标签，检查是否有JavaScript语法错误或DOM选择失败的提示。
• 确认accountPerks.txt文件存在于正确路径，且服务器拥有读取权限。

内容的提问来源于stack exchange，提问作者JosephA