setinterval usecallback
时间: 2023-08-07 20:05:46 浏览: 98
`setInterval` is a function in JavaScript that allows you to repeatedly execute a function after a certain amount of time has passed. The `useCallback` hook in React is used to memoize a function so that it only gets re-created if one or more of its dependencies have changed, which can improve performance.
To use `setInterval` with `useCallback`, you can define the function you want to repeatedly execute as a callback function and then memoize it using `useCallback`. Here's an example:
```jsx
import React, { useCallback, useEffect, useState } from 'react';
function MyComponent() {
const [count, setCount] = useState(0);
const incrementCount = useCallback(() => {
setCount(prevCount => prevCount + 1);
}, []);
useEffect(() => {
const intervalId = setInterval(incrementCount, 1000);
return () => clearInterval(intervalId);
}, [incrementCount]);
return (
<div>
<p>Count: {count}</p>
</div>
);
}
```
In this example, we define the `incrementCount` function using `useCallback` so that it only gets re-created if the `count` state changes. We then use `useEffect` to set up an interval that calls the `incrementCount` function every second. Finally, we return a JSX element that displays the current value of `count`.
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