react useref

Check out my first, if you’re new to them.

如果您是新手，请先查看我的 。

One React hook I sometimes use is useRef.

我有时使用的一个React挂钩是useRef 。

import React, { useRef } from 'react'

This hook allows us to access a DOM element imperatively.

这个钩子允许我们强制性地访问DOM元素。

Here’s an example, where I log to the console the value of the DOM reference of the span element that contains the count value:

这是一个示例，其中我将包含计数值的span元素的DOM引用的值登录到控制台：

import React, { useState, useRef } from 'react'const Counter = () => {  const [count, setCount] = useState(0)  const counterEl = useRef(null)  const increment = () => {    setCount(count + 1)    console.log(counterEl)  }  return (    <>      Count: {count}      +      )}ReactDOM.render(
     , document.getElementById('app'))

Notice the const counterEl = useRef(null) line, and the <span ref={counterEl}>{count}</span>. This is what sets the link.

注意const counterEl = useRef(null)行，以及<span ref={counterEl}>{count}</span> 。 这就是设置链接的原因。

Now we can access the DOM reference by accessing counterEl.current.

现在，我们可以通过访问counterEl.current来访问DOM引用。

See it on Codepen:

在Codepen上查看：

See the Pen by Flavio Copes () on .

见笔由弗拉维奥·科佩斯( 上) 。

翻译自:

react useref