更新下 使用yarn貌似会帮助跳过这个问题：

info fsevents@2.1.2: The platform "win32" is incompatible with this module.
info "fsevents@2.1.2" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.9: The platform "win32" is incompatible with this module.
info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.

===

有需要下载了一个模板项目，安装ui部分失败，提示：

npm WARN deprecated fsevents@1.2.9: One of your dependencies needs to upgrade to fsevents v2: 1) Proper nodejs v10+ support 2) No more fetch
ing binaries from AWS, smaller package size
npm ERR! Unexpected end of JSON input while parsing near '...LNCxGNsOAHRWRMGoXrtcI'

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\user\AppData\Roaming\npm-cache\_logs\2019-12-06T07_31_31_687Z-debug.log

单独提出来安装：

$ npm install fsevents
npm ERR! code EBADPLATFORM
npm ERR! notsup Unsupported platform for fsevents@2.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm ERR! notsup Valid OS: darwin
npm ERR! notsup Valid Arch: any
npm ERR! notsup Actual OS: win32
npm ERR! notsup Actual Arch: x64

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\neoliu6\AppData\Roaming\npm-cache\_logs\2019-12-06T07_33_23_843Z-debug.log

原因明了了，这个包是在mac系统中的，windows没有。查了下资料，大概是windows也不需要，不用安装。

解决方法是，把fsevents依赖放到可选依赖中：

vi package.json

  "optionalDependencies": {

    "fsevents": "*"

  }

重新执行安装(有个坑，需要删除package_lock.json,否则标记会失效，所有依赖都将被安装):

参考资料：

https://stackoverflow.com/questions/41570364/npm-install-not-working-in-windows#

But it says it is optional so I ran $npm install --no-optional and that error went away but I still can't install.

https://github.com/npm/npm/issues/17633

I'm seeing this today with npm 5.3.0. npm install --no-optional works IIF a package-lock.json does not exist. If the package-lock.json file exists, then the flag is ignored and all dependencies get installed.

3.撤换taobao源后，使用create-reat-app命令生成的app,默认package.json文件中不带运行脚本命令如下：

（node: ver2.13.1  npm ver:6.12.1）

{
  "name": "test",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.3.0"
  }
}

需要手动添加运行脚本代码如下：

{
  "name": "test",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

还有public,src等目录需要自己添加，当然业务代码需要自己编写哦
然后才能通过npm run start 命令才能运行项目。

使用系统默认源的配置信息如下：
npm config list

"react": "^16.12.0",
"react-dom": "^16.12.0",
"react-scripts": "3.3.0"

"scripts": {
    "start": "SET PORT & react-scripts start",　　
　　　。。。。。。