MacOS安装react。问题 -- npm全局包的权限问题
网上的教程有好多，在这里不一一列举，我只介绍我今天安装成功的步骤
首先，在安装react之前要先配置好node
1.安装node
在这里下载node的安装包https://nodejs.org/en/download/ 。我下载的是.pkg文件，直接双击安装就好
node —v命令检验是否安装成功
npm -v用来检测npm
2.通过npm使用react
国内使用 npm 速度很慢，你可以使用淘宝定制的 cnpm (gzip 压缩支持) 命令行工具代替默认的 npm:
$ npm install -g cnpm --registry=https://registry.npm.taobao.org
$ npm config set registry https://registry.npm.taobao.org
一般这个时候就可以使用cnpm来进行操作，但是我的一直显示命令未找到。所以我放弃了使用cnpm，继续使用npm命令
给npm配置taobao镜像的registry
npm config set registry https://registry.npm.taobao.org
然后直接用
npm install gulp less --save-dev
就是从taobao镜像拿包了
3.两种react开发环境构建
使用 create-react-app 快速构建 React 开发环境
create-react-app 是来自于 Facebook，通过该命令我们无需配置就能快速构建 React 开发环境。
create-react-app 自动创建的项目是基于 Webpack + ES6 。
执行以下命令创建项目：
$ cnpm install -g create-react-app
$ create-react-app my-app
$ cd my-app/
$ npm start
MacOS，安装npm全局包提示没有写入权限：
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
解决方法：
修改npm包所安装目录的权限：sudo chown -R $USER /usr/local 然后输入密码就可以了
查看目录是否已切换权限：$ls -l /usr/local
接下来可以进行npm全局包安装：例如$npm install webpack -g
-----------------------------
安装问题
123deAir:~ mxt$ npm install create-react-app -g
WARN checkPermissions Missing write access to /usr/local/lib/node_modules
ERR! path /usr/local/lib/node_modules
ERR! code EACCES
ERR! errno -13
ERR! syscall access
ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
ERR! { [Error: EACCES: permission denied, access '/usr/local/lib/node_modules']
ERR! stack:
ERR! 'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules\'',
ERR! errno: -13,
ERR! code: 'EACCES',
ERR! syscall: 'access',
ERR! path: '/usr/local/lib/node_modules' }
npm
ERR! The operation was rejected by your operating system.
ERR! It is likely you do not have the permissions to access this file as the current user
npm
ERR! If you believe this might be a permissions issue, please double-check the
ERR! permissions of the file and its containing directories, or try running
ERR! the command again as root/Administrator (though this is not recommended).
ERR! A complete log of this run can be found in:
ERR! /Users/mxt/.npm/_logs/2018-12-19T09_09_15_552Z-debug.log
123deAir:~ mxt$ npm install -g create-react-app
WARN checkPermissions Missing write access to /usr/local/lib/node_modules
ERR! path /usr/local/lib/node_modules
ERR! code EACCES
ERR! errno -13
ERR! syscall access
ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
ERR! { [Error: EACCES: permission denied, access '/usr/local/lib/node_modules']
ERR! stack:
ERR! 'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules\'',
ERR! errno: -13,
ERR! code: 'EACCES',
ERR! syscall: 'access',
ERR! path: '/usr/local/lib/node_modules' }
npm
ERR! The operation was rejected by your operating system.
ERR! It is likely you do not have the permissions to access this file as the current user
npm
ERR! If you believe this might be a permissions issue, please double-check the
ERR! permissions of the file and its containing directories, or try running
ERR! the command again as root/Administrator (though this is not recommended).
ERR! A complete log of this run can be found in:
ERR! /Users/mxt/.npm/_logs/2018-12-19T09_11_38_006Z-debug.log
123deAir:~ mxt$ sudo npm install webpack -g
Password:
/usr/local/bin/webpack -> /usr/local/lib/node_modules/webpack/bin/webpack.js
> fsevents@1.2.4 install /usr/local/lib/node_modules/webpack/node_modules/fsevents
> node install
[fsevents] Success: "/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v64-darwin-x64/fse.node" already installed
Pass --update-binary to reinstall or --build-from-source to recompile
+ webpack@4.27.1
added 389 packages from 297 contributors in 30.263s
123deAir:~ mxt$ sudo chown -R $USER /usr/local
123deAir:~ mxt$ ls -l /usr/local
total 0
drwxr-xr-x 6 mxt wheel 204 12 19 01:19 bin
drwxr-xr-x 3 mxt wheel 102 12 10 13:29 include
drwxr-xr-x 73 mxt wheel 2482 12 19 00:28 lib
drwxr-xr-x 5 mxt wheel 170 12 10 13:29 share
123deAir:~ mxt$ sudo chown -R $USER /usr/local
123deAir:~ mxt$ ls -l /usr/local
total 0
drwxr-xr-x 6 mxt wheel 204 12 19 01:19 bin
drwxr-xr-x 3 mxt wheel 102 12 10 13:29 include
drwxr-xr-x 73 mxt wheel 2482 12 19 00:28 lib
drwxr-xr-x 5 mxt wheel 170 12 10 13:29 share
123deAir:~ mxt$ webpack -g
One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:
- webpack-cli (https://github.com/webpack/webpack-cli)
The original webpack full-featured CLI.
We will use "npm" to install the CLI via "npm install -D".
Do you want to install 'webpack-cli' (yes/no): npm install webpack -g
You need to install 'webpack-cli' to use webpack via CLI.
You can also install the CLI manually.
123deAir:~ mxt$ npm install -g create-react-app
/usr/local/bin/create-react-app -> /usr/local/lib/node_modules/create-react-app/index.js
+ create-react-app@2.1.1
added 63 packages from 20 contributors in 8.958s
123deAir:~ mxt$ create-react-app my-app
Creating a new React app in /Users/mxt/my-app.
Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts...
> fsevents@1.2.4 install /Users/mxt/my-app/node_modules/fsevents
> node install
[fsevents] Success: "/Users/mxt/my-app/node_modules/fsevents/lib/binding/Release/node-v64-darwin-x64/fse.node" already installed
Pass --update-binary to reinstall or --build-from-source to recompile
+ react-scripts@2.1.1
+ react-dom@16.6.3
+ react@16.6.3
added 1776 packages from 684 contributors in 120.945s
Success! Created my-app at /Users/mxt/my-app
Inside that directory, you can run several commands:
npm start
Starts the development server.
npm run build
Bundles the app into static files for production.
npm test
Starts the test runner.
npm run eject
Removes this tool and copies build dependencies, configuration files
and scripts into the app directory. If you do this, you can’t go back!
We suggest that you begin by typing:
cd my-app
npm start
Happy hacking!
123deAir:~ mxt$
/////////安装命令
npm install create-react-app -g // 全局安装create-react-app，如果不想全局安装，则不要-g。可能会很慢，可以使用cnpm来安装 create-react-app my-app // my-app是项目名 cd my-app npm start // 启动项目
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