vue2 resizeobserver loop completed with undelivered notifications.

根据提供的引用内容，解决"vue2 resizeobserver loop completed with undelivered notifications"错误的方法如下：

1. 使用防抖函数：

const debounce = (fn, delay) => {
  let timer = null;
  return function () {
    let context = this;
    let args = arguments;
    clearTimeout(timer);
    timer = setTimeout(function () {
      fn.apply(context, args);
    }, delay);
  }
}

2. 重写ResizeObserver类：

const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
  constructor(callback) {
    callback = debounce(callback, 16);
    super(callback);
  }
}

3. 在需要使用ResizeObserver的地方添加show-overflow-tooltip属性：

<el-table-column prop="title" label="标题" min-width="100" show-overflow-tooltip />

这些方法可以解决"vue2 resizeobserver loop completed with undelivered notifications"错误。