# 警告：React.memo：比较函数对不相等的 props 返回了 true。这可能导致组件在需要更新时跳过渲染。

- **ID:** `react/memo-wrong-comparison`
- **领域:** react
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 90%

## 根因

传递给 React.memo 的自定义比较函数对实际上不同的 props 错误地返回 true（相等），导致组件在应该更新时跳过了重新渲染。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| React 16.6+ | active | — | — |
| React 17.x | active | — | — |
| React 18.x | active | — | — |

## 解决方案

1. ```
   Fix the comparison function to correctly compare all relevant props. Example: const MyComponent = React.memo(Comp, (prevProps, nextProps) => { return prevProps.id === nextProps.id && prevProps.name === nextProps.name; }); Ensure it returns false when props differ.
   ```
2. ```
   If the component relies on deep equality, use a library like lodash.isEqual for the comparison: import isEqual from 'lodash.isequal'; React.memo(Comp, isEqual);
   ```
3. ```
   Remove the custom comparison function and let React.memo use default shallow comparison, but ensure props are immutable references.
   ```

## 无效尝试

- **** — Shallow comparison may still miss deep changes, and the warning indicates the custom function is buggy, not that shallow is better. (70% 失败率)
- **** — JSON.stringify is slow and can produce false positives for object key order; also triggers the same warning if not careful. (85% 失败率)
- **** — Defeats the purpose of memoization and may cause performance issues, but does not fix the underlying logic error. (65% 失败率)