In React.js, you can add an object to an array by using the spread operator. First, create a new object that you want to add. Then, use the spread operator (...) to create a new array that includes the existing objects in the array, along with the new ob
在上面的代码中,我们使用useState Hook来创建一个名为myObject的状态变量,并将其初始值设置为一个包含空数组的对象。然后,我们定义了一个addDataToArray函数,它接受一个数据参数,并在函数内部创建一个新的数组newArray,将原数组myObject.array中的数据和新数据一起添加到新数组中。最后,我们使用setMyObject函数更...
You will rely on JavaScript features like for loop and the array map() function to render lists of components. 例如,假设你有一个产品列表: const products = [ { title: 'Cabbage', id: 1 }, { title: 'Garlic', id: 2 }, { title: 'Apple', id: 3 }, ]; Inside your component, use...
使用event.currentTarget访问DOM元素。 使用classList.add()或者classList.remove()方法。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 import'./App.css';exportdefaultfunctionApp(){consthandleClick=event=>{// 👇️ toggle class on clickevent.currentTarget.classList.toggle('bg-salmon');// 👇...
在React项目中导入excle 我们可以使用xlsx插件来实现 (1)下载插件 yarn add xlsx (2)自定义hook函数 导入导出插件在项目中经常会用到,我们可以将这个功能封装为自定义hook,后续可以在任何一个页面或者组件中使用。 src/hooks/useExportExcle.js import*asXLSXfrom"xlsx"constuseExportExcle=()=>{consthandleExportAl...
object-rest-spread" "^7.8.0" + "@babel/plugin-syntax-optional-catch-binding" "^7.8.0" + "@babel/plugin-syntax-optional-chaining" "^7.8.0" + "@babel/plugin-syntax-top-level-await" "^7.12.13" + "@babel/plugin-transform-arrow-functions" "^7.12.13" + "@babel/plugin-transform-...
Since version 3.2.1 it is also possible to import types forpropsandrefindependently: importHighchartsReact,{HighchartsReactRefObject,HighchartsReactProps}from'highcharts-react-official'; Highcharts with NextJS Next.js executes code twice - on server-side and then client-side. First run is done ...
简介:React课时三 项目结构二 "node_modules/@babel/plugin-transform-runtime": {"version": "7.21.4","resolved": "https://registry.npmmirror.com/@babel/plugin-transform-runtime/-/plugin-transform-runtime-7.21.4.tgz","integrity": "sha512-1J4dhrw1h1PqnNNpzwxQ2UBymJUF8KuPjAAnlLwZcGhHAIqUigF...
function addFruitToArray() { // The spread operator `...fruits` adds all elements // from the `fruits` array to the `newFruits` array // and then we add the `currentFruit` to the array as well const newFruits = [...fruits, currentFruit] ...
[PATCH] initial commit --- package.json | 6 + public/index.html | 2 +- src/App.css | 38 -- src/App.js | 25 -- src/App.test.js | 8 - src/components/AddBook.js | 20 + src/components/Book.js | 37 ++ src/components/BookForm.js | 128 +++++ src/components/BooksList.js ...