小编mat*_*teo的帖子

基本上就是这个。我都尝试过

npm init react-app my-app

和

npx create-react-app my-app

我总是收到这样的消息：

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! Found: @babel/core@7.12.3
npm ERR! node_modules/@babel/core
npm ERR!   @babel/core@"7.12.3" from react-scripts@4.0.3
npm ERR!   node_modules/react-scripts
npm ERR!     react-scripts@"*" from the root project
npm ERR!   @babel/core@"^7.12.3" from @svgr/webpack@5.5.0
npm ERR!   node_modules/@svgr/webpack
npm ERR!     @svgr/webpack@"5.5.0" from react-scripts@4.0.3
npm ERR!     node_modules/react-scripts
npm ERR!       react-scripts@"*" from the root project
npm ERR!   9 more (babel-jest, babel-loader, ...)
npm ERR!
npm ERR! …

我有一个关于 js 循环及其实际工作原理的问题。我正在循环访问如下所示的对象数组：

const array = [{value: 0}, {value: 0}, {value: 0}, {value: 0}];

循环只是更新每个元素的值：

array.forEach(el => {
        el.value = 1;
        console.log(array)
})

我不明白的是为什么输出看起来像这样：

[{value: 1}, {value: 1}, {value: 1}, {value: 1}]
[{value: 1}, {value: 1}, {value: 1}, {value: 1}]
[{value: 1}, {value: 1}, {value: 1}, {value: 1}]
[{value: 1}, {value: 1}, {value: 1}, {value: 1}]

而不是这样的：

[{value: 1}, {value: 0}, {value: 0}, {value: 0}]
[{value: 1}, {value: 1}, {value: 0}, {value: 0}]
[{value: 1}, {value: 1}, {value: 1}, {value: …