如何检测 div 或 body 的变化？

Question

我有如下脚本，需要检测：

内容元素有变化（例如size/position）或
body 元素有变化（例如size/position）

我无法在按钮本身上执行此逻辑。

有哪些活动？你能提供一个代码示例吗？

<!DOCTYPE html>
<html>

<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
    <script>
        window.App = {
            start: function () {
                var btn = document.getElementById('addContent');
                btn.addEventListener('click', function () {
                    var body = document.getElementsByTagName('body')[0];
                    body.innerHTML += '<p>ADDED LATER - Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>';
                });

                //---
                // does not work i need the content
                window.addEventListener('resize', function () {
                    console.log('content / window / resize');
                });

                var content = document.getElementById('content');
                content.addEventListener('change', function () {
                    console.log('content / div / resize');
                }.bind(this));
            }
        };
    </script>
</head>


<body onload="App.start();">
    <div id="content">
        <button id="addContent" type="button">Add content!</button>
        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
    </div>
</body>

</html>

Answer 1

MutationObserver 提供了一种对 DOM 中的任何变化做出反应的方法。

在 MDN or MSDN

阅读更多内容

还有这个话题enter link description here

Answer 2

勾选这个link

而不是'change'使用'DOMNodeInserted'并使用ID更改div的html content 而不是 body

的 innerHTML

您可以在浏览器控制台中看到 content / div / resize

Answer 3

另外一个建议（不确定是否符合您的要求），您可以创建自定义事件并在需要时触发它：

window.App = {
    start: function () {
        var customEvent = new Event("customEvent"), // your custom event
            content = document.getElementById('content'),
            btn = document.getElementById('addContent');
        
        btn.addEventListener('click', function () {
            var body = document.getElementsByTagName('body')[0];
            body.innerHTML += '<p>ADDED LATER - Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>';

            // trigger it
            content.dispatchEvent(customEvent);
        });
        
        content.addEventListener('customEvent', function () {
            console.log('content / div / resize');
        });
    }
};
App.start();

<div id="content">
    <button id="addContent" type="button">Add content!</button>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</div>

如何检测 div 或 body 的变化？

How to detect change in a div or body?

html

javascript

css

dojo