使用 useRef 或 createRef [英] using useRef or createRef

问题描述

我想通过按下按钮将 const [solution, setSolution] = useState(0); 设置为输入元素的值

I want to set the const [solution, setSolution] = useState(0); with the value of a input element by pressing a button

我使用 createRef 或使用 useRef 钩子获得相同的结果

I get the same result using createRef or using the useRef hook

阅读useRef 和createRef 有什么区别?

reading What's the difference between useRef and createRef?

给出了不同的答案，你到底要做什么，你对方法有明确的内在吗?

gives quit different answers what exactly thees to do, is there a clear inside about thees to methods ?

function Interface() {

    const [solution, setSolution] = useState(0);
  
    const solutionInp = useRef();
    //                --createRef();
    
    const onButtonClick = () => {
    // `current` points to the mounted text input element
    setSolution( solutionInp.current.value)
      };


return (
 
<input
 type="text"
 // value={solution}
 
 ref={solutionInp}
 // onInput={(e) => setSolution(e.target.value)}
 />
 </section>
<button type="button" onClick={onButtonClick}>do</button>
)}

推荐答案

createRef 用于类组件，在函数组件的上下文中调用它会视为正常函数，因此将在每次渲染时重新初始化您的参考.

createRef is for class components, calling it in a context of function component will be treated as a normal function, hence will RE-INITIAL your reference on every render.

useRef 用于函数组件，卸载时会丢失引用.

useRef is for function components, you lose your ref on unmount.

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