Javascript DOM 添加/删除事件

Question

这个问题已经有答案了:

奥 git _a (5 个回答)

已关闭 5 年前。

我希望在从 DOM 树中删除元素时执行一些清理工作，更具体地说，是 ParentElement.removeChild(ChildElement) 。我想知道当 ChildElement 被删除时是否会发出任何可以在代码中监听的事件？

Answer 1

是的，您可以使用 MutationObserver 监听对 DOM 的操作.

来自 MDN 文档的示例:

// Select the node that will be observed for mutations
var targetNode = document.getElementById('some-id');

// Options for the observer (which mutations to observe)
var config = { attributes: true, childList: true };

// Callback function to execute when mutations are observed
var callback = function(mutationsList) {
    for(var mutation of mutationsList) {
        if (mutation.type == 'childList') {
            console.log('A child node has been added or removed.');
        }
        else if (mutation.type == 'attributes') {
            console.log('The ' + mutation.attributeName + ' attribute was modified.');
        }
    }
};

// Create an observer instance linked to the callback function
var observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// Later, you can stop observing
observer.disconnect();