xiaohongshu
xiaohongshu
debug-helper
Help debug code by analyzing error messages, identifying root causes, and providing fix suggestions.
Full skill instructions
帮助调试代码,分析错误信息,定位问题根源,提供修复建议。
Help debug code by analyzing error messages, identifying root causes, and providing fix suggestions.
当用户请求以下操作时使用此 skill:
| 错误类型 | 可能原因 |
|---|---|
| TypeError | 类型不匹配、空值操作 |
| ReferenceError | 未定义变量、作用域问题 |
| SyntaxError | 语法错误、缺少括号/引号 |
| RuntimeError | 运行时逻辑错误 |
| NetworkError | 网络请求失败、超时 |
对于每个错误,需要分析:
使用 templates/debug-report.md 模板格式化输出。
Use the templates/debug-report.md template to format output.
## 调试分析报告 / Debug Analysis Report
### 错误概述 / Error Summary
[错误类型和简要描述]
### 根本原因 / Root Cause
[详细分析]
### 修复方案 / Fix
[具体代码修改]
### 预防建议 / Prevention
[如何避免类似问题]
错误信息:
TypeError: Cannot read properties of undefined (reading 'map')
at UserList (UserList.jsx:15:23)
at renderWithHooks (react-dom.development.js:14985:18)
相关代码:
function UserList({ users }) {
return (
<ul>
{users.map(user => (
<li key={user.id}>{user.name}</li>
))}
</ul>
);
}
TypeError: Cannot read properties of undefined (reading 'map')
在 UserList 组件第 15 行调用 .map() 时,users 变量为 undefined。
undefined 上调用 .map() 方法users prop方案 1: 添加默认值(推荐)
function UserList({ users = [] }) {
return (
<ul>
{users.map(user => (
<li key={user.id}>{user.name}</li>
))}
</ul>
);
}
方案 2: 条件渲染
function UserList({ users }) {
if (!users || users.length === 0) {
return <p>No users found</p>;
}
return (
<ul>
{users.map(user => (
<li key={user.id}>{user.name}</li>
))}
</ul>
);
}
方案 3: 可选链操作符
function UserList({ users }) {
return (
<ul>
{users?.map(user => (
<li key={user.id}>{user.name}</li>
))}
</ul>
);
}
使用 TypeScript - 添加类型检查
interface Props {
users: User[];
}
添加 PropTypes - 运行时类型检查
UserList.propTypes = {
users: PropTypes.array.isRequired
};
检查数据源 - 确保父组件正确传递数据
处理加载状态 - 在数据获取期间显示加载指示器
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