javascript – 未捕获TypeError：无法在’MutationObserver’上执行’observe’：参数1不是’Node’类型

所以我的代码在jsfiddle中独立工作.但由于一些奇怪的原因..我把它推到现场服务器后一直得到这个错误：/我无法弄清楚为什么……

mycodewitherror.js:23 Uncaught TypeError: Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.

JS：

$(document).ready(function() {
// The below collects user login name,new login date and time,and prevIoUs use URL
var element = document.querySelector('.pet-name'); 
// create an observer instance
var observer = new MutationObserver(function(mutations) {
      var username = $('.pet-name').text();
      var referrer = document.referrer;
      var date = new Date();
      var month = date.getUTCMonth() + 1;
      var day = date.getUTCDate();
      var year = date.getUTCFullYear();
      var time = date.toLocaleTimeString();
      var formattedDate = month + '/' + day + '/' + year;
    console.log("Pet Name Time"); 
      console.log(referrer); 
      console.log(petname); 
      console.log(time); 
      console.log(formattedDate);   
});

// configuration of the observer:

var config = { attributes: true,childList: true,characterData: true };

// pass in the target node,as well as the observer options
observer.observe(element,config);

解决方法

我遇到了同样的错误,并通过在onload / ready下插入.observe()方法而不是观察者var定义,加上target(element)和config变量的定义来解决它：

$(document).ready(function () {
    var target = document.getElementById("myList");
     var config = {
        childList: true,subtree: true,attributes: true,characterData: true
    };
//note this observe method
    observer.observe(target,config);
    console.log("registered");
});

var observer = new MutationObserver(function (mutationRecords,observer) {
    mutationRecords.forEach(function (mutation) {
        console.log("mutation change in ",mutation.type," name: ",mutation.target);
    });
});

function add() {
    var index = $("ul li").length;
    var listItem = document.createElement("li");
    listItem.textContent = index + 1;
    var target = document.getElementById("myList").appendChild(listItem,"before");
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body >
    <button onclick="add()">Add list item</button>
    <hr>
    <ul id="myList">
        <li><a href="#">1</a></li>
        <li><a href="#">2</a></li>
    </ul>
    
</body>

请运行代码段,单击“添加列表项”按钮,然后在控制台中查看更改日志.

javascript – 未捕获TypeError：无法在’MutationObserver’上执行’observe’：参数1不是’Node’类型

解决方法

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