ErrorBoundary

// 不会触发 error boundary
```js
function Content() {
  const [arr, setArr] = useState({})
  
  return (
    <ErrorBoundary1>
      <Table />
      {arr.maps(i => <div>{i}</div>)}
    </ErrorBoundary1>
  )
}
```

// 在组件外层才可以，而不是 jsx 的外层
```js
function App() {
  return (
    <ErrorBoundary2>
      <Content />
    </ErrorBoundary2>
  )
}
```