mutationObserver 与 nextTick

mutationObserver 可以监听节点为的变化

const oTarget = document.getElementById('app');
function cb (mutationList, observer) {
    console.log(mutationList, observer);
}
const observer = new MutationObserver(cb);
observer.observe(oTarget, {
    attrributes: true,
  childList: true,
  subtree: true
});

process.nextTick 是 nodeJS 的方法

Promise.resolve().then(() => {
    console.log('Promise');
});

setTimeout(() => {
    console.log('setTimeout'), 0)
});

process.nextTick(() => {
    console.log('nextTick');
});

// nextTick
// Promise
// setTimeout

作为微任务优先于 Promise 的运行