ResizeObserver loop completed with undelivered notifications. 报错

蓓蕾心晴

发布于 2024-11-21 03:31:47

64800

代码可运行

文章被收录于专栏：前端小叙前端小叙

运行总次数：0

代码可运行

js 使用 ResizeObserver 时报错，代码实现逻辑如下：

function observeVideoDom (width: number, height: number) {
    const videoDom = document.getElementById('videoDom')
    if (!videoDom) return
    if (window.ResizeObserver) {
      // ResizeObserver 在 iOS13.4及以上，安卓 4.4.5及以上才支持，如果不支持用轮询判断
      const resizeObserver = new ResizeObserver(() => {
        videoSizeReset(width, height)
      })
      resizeObserver.observe(videoDom)
    } else {
      let previousWidth = videoDom.clientWidth
      let previousHeight = videoDom.clientHeight
      const checkSize = () => {
        const currentWidth = videoDom.clientWidth
        const currentHeight = videoDom.clientHeight
        if (currentWidth !== previousWidth || currentHeight !== previousHeight) {
          videoSizeReset(width, height)
          previousWidth = currentWidth
          previousHeight = currentHeight
        }
      }
      const scheduleCheck = () => {
        checkSize()
        requestAnimationFrame(scheduleCheck)
      }
      requestAnimationFrame(scheduleCheck)
    }
  }

主要功能是监测 videoDom 元素的盒子大小变化后，重新赋值videoDom 元素的盒子大小，由于重新赋值的操作会再次改变 videoDom 元素的盒子大小，会导致报错了 ResizeObserver loop completed with undelivered notifications.

解决方案，给 ResizeObserver 的回调函数加防抖或者 requestAnimationFrame

改后如下：

function observeVideoNativeDom (width: number, height: number) {
    const videoNativeDom = document.getElementById('video-native')
    if (!videoNativeDom) return
    if (window.ResizeObserver) {
      // ResizeObserver 在 iOS13.4及以上，安卓 4.4.5及以上才支持，如果不支持用轮询判断
      const resizeObserver = new ResizeObserver(debounce(() => {
        videoSizeReset(width, height)
      }, 300))
      resizeObserver.observe(videoNativeDom)
    } else {
      let previousWidth = videoNativeDom.clientWidth
      let previousHeight = videoNativeDom.clientHeight
      const checkSize = () => {
        const currentWidth = videoNativeDom.clientWidth
        const currentHeight = videoNativeDom.clientHeight
        if (currentWidth !== previousWidth || currentHeight !== previousHeight) {
          videoSizeReset(width, height)
          previousWidth = currentWidth
          previousHeight = currentHeight
        }
      }
      const scheduleCheck = () => {
        checkSize()
        requestAnimationFrame(scheduleCheck)
      }
      requestAnimationFrame(scheduleCheck)
    }
  }
// 或者