DOM Observer

MutationObserver

MutationObserver 接口可以检测 DOM 树的变化

Methods

• 主方法为 observe(target, options)，可以配置需要检测的节点变化、子节点和属性等

• 停止检测 disconnect()

const observer = new MutationObserver(callback)
observer.observe(targetNode, options)

observer.disconnect()

Example

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

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

// Callback function to execute when mutations are observed
const callback = function(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for (const 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
const observer = new MutationObserver(callback);

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

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

• A brief overview

See also

• PerformanceObserver
• ResizeObserver
• IntersectionObserver