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Description
报错信息：
TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
解决思路
import { useState, useEffect } from 'react';
export const useSize = (domRef: React.RefObject<HTMLElement>) => {
const [size, setSize] = useState({ width: 0, height: 0 });
useEffect(() => {
const element = domRef.current;
if (!element) {
console.warn('`useSize`: domRef is null or undefined.');
return;
}
if (typeof ResizeObserver === 'undefined') {
console.warn('`useSize`: ResizeObserver is not supported by this browser.');
return;
}
let isMounted = true; // 防止卸载后更新状态
const observer = new ResizeObserver(entries => {
if (!isMounted) return;
try {
const entry = entries[0];
if (entry && entry.target.isConnected) {
const { width, height } = entry.contentRect;
setSize({ width, height });
}
} catch (error) {
console.error('`useSize`: Error in ResizeObserver callback.', error);
}
});
observer.observe(element);
return () => {
isMounted = false;
observer.disconnect(); // 确保在卸载时断开监听
};
}, [domRef]);
return size;
};Metadata
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