【Bug】ERROR ResizeObserver loop completed with undelivered notifications.

简介: 【Bug】ERROR ResizeObserver loop completed with undelivered notifications.

报错如下:

ERROR
ResizeObserver loop completed with undelivered notifications.
    at handleError (webpack-internal:///./node_modules/webpack-dev-server/client/overlay.js:299:58)
    at eval (webpack-internal:///./node_modules/webpack-dev-server/client/overlay.js:318:7)

报错的原因:在页面绘制的时候,页面突然发生调整大小的事件,导致了样式和布局都需要重新评估,这个调整大小导致的布局变化,将延迟到下一帧来绘制。

解决方案:

在App.vue文件中添加以下代码:

<script >
// 解决ERROR ResizeObserver loop completed with undelivered notifications.
//问题的
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);
  };
};
// 解决ERROR ResizeObserver loop completed with undelivered notifications.
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
  constructor(callback) {
    callback = debounce(callback, 16);
    super(callback);
  }
};
</script>

下面是对这个代码的解释:

首先,debounce函数用于限制一个函数的执行频率,确保在一定时间间隔内只执行一次。它接受两个参数,一个是要执行的函数fn,另一个是延迟时间delay。函数内部使用setTimeout来实现延迟执行,每次调用时会清除之前的定时器,然后设置一个新的定时器来延迟执行目标函数。

接下来,代码对window.ResizeObserver进行了扩展。它将原始的ResizeObserver保存为_ResizeObserver,然后定义了一个新的ResizeObserver类,重写了其构造函数。在新的构造函数中,传入的回调函数被用debounce函数处理,确保回调函数在16毫秒的间隔内执行一次。这样做是为了限制ResizeObserver的回调频率,以避免过多的触发,提高性能。

这段代码实现了对ResizeObserver的改写,通过限制回调函数的执行频率来优化性能。

通过调整回调频率能解决上面讲解的问题报错原因。


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