回答: 在React中,useState是一个React Hook,用于在函数组件中添加状态。当使用useState时,有时会遇到错误信息"useState is read-only",这通常是由于在组件中错误地尝试修改useState返回的状态值。 useState返回一个数组,其中包含当前状态的值和一个更新状态的函数。由于React的设计原则是不允许直接修改状态值,因此尝试直...
主要是class组件比较冗余、生命周期函数写法不友好，骚写法多，functional组件更符合React编程思想等等等。
当我们使用 null 值初始化 ref 并且在其类型中不包含 null 时,会出现错误“Cannot assign to 'current' because it is a read-only property”。 要解决该错误,请在 ref 的类型中包含 null,例如const ref = useRef<string | null>(null)。 下面是一个错误发生的示例。 import{useEffect, useRef}from'react...
这里有个例子来展示错误是如何发生的。 // App.tsximport{useEffect, useRef}from'react';constApp= () => {constref = useRef<string>(null);useEffect(() =>{// ⛔️ Error: Cannot assign to 'current' because it is a read-only property.ts(2540)ref.current='hello'; }, []);return(hell...
A lightweight version with <One /> component and dependencies only published in react-declarative-lite npm package. Useful when you want to use <One /> forms in existing app npm install --save react-declarative-lite Demos Note The react-declarative is not just a form builder. This one is...
Type '{}'等等，是因为state字段是从React.Component继承的。默认情况下，this.state的类型为Readonly<...
解决React报错Cannot assign to 'current' because it is a read-only property 总览 当我们用一个null值初始化一个ref,但在其类型中不包括null时,就会发生"Cannot assign to 'current' because it is a read-only property"错误。为了解决该错误,请在ref的类型中包含null。比如说,const ref = useRef<string ...
This repository is DEPRECATED! GO TO 👉 https://github.com/nhn/tui.editor/tree/master/apps/react-editor - nhn/toast-ui.react-editor
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