JavaScript MutationObserver 实例讲解

const createObserve = new MutationObserver((mutationRecoard,observe)=>{
})

	<div class="content">
		<ui>
			<li class="0">0000000</li>
			<li class="1">1111111</li>
			<li class="2">222222</li>
			<li class="3">33333</li>
			<li class="4">4444</li>
			<li class="5">55555</li>
			<li class="6">6666</li>
			<li class="7">77777</li>
			<li class="8">888888</li>
			<li class="9">99999</li>
		</ui>
	</div>

// 观察器的配置（需要观察什么变动）
const config = { attributes: true, childList: true, subtree: true,characterData:true,characterDataOldValue:true,attributDataOldValue:true};
// 当观察到变动时执行的回调函数
const callback = function(mutationRecoard, observer) {
    // Use traditional 'for loops' for IE 11
    for(let mutation of mutationRecoard) {
        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.');
        }
    }
};
// 创建一个观察器实例并传入回调函数
const observer = new MutationObserver(callback);
// 以上述配置开始观察目标节点
observer.observe(document.getElementsByClassName('content')[0], config);
// 之后，可停止观察
observer.disconnect();