npx create-react-app警告，求解释
内容如下：
C:\Users\qq163\Desktop\test>npx create-react-app 1
npx: installed 67 in 4.001s
Creating a new React app in C:\Users\qq163\Desktop\test\1.
Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts with cra-template...
> core-js@2.6.12 postinstall C:\Users\qq163\Desktop\test\1\node_modules\babel-runtime\node_modules\core-js
> node -e "try{require('./postinstall')}catch(e){}"
> core-js@3.18.0 postinstall C:\Users\qq163\Desktop\test\1\node_modules\core-js
> node -e "try{require('./postinstall')}catch(e){}"
> core-js-pure@3.18.0 postinstall C:\Users\qq163\Desktop\test\1\node_modules\core-js-pure
> node -e "try{require('./postinstall')}catch(e){}"
> ejs@2.7.4 postinstall C:\Users\qq163\Desktop\test\1\node_modules\ejs
> node ./postinstall.js
+ cra-template@1.1.2
+ react-dom@17.0.2
+ react-scripts@4.0.3
+ react@17.0.2
added 1907 packages from 708 contributors in 98.34s
149 packages are looking for funding
run `npm fund` for details
Initialized a git repository.
Installing template dependencies using npm...
npm WARN @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining@7.15.4 requires a peer of @babel/core@^7.13.0 but none is installed. You must install peer dependencies yourself.
npm WARN tsutils@3.21.0 requires a peer of typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.3.2 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.3.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules\watchpack-chokidar2\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules\webpack-dev-server\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
+ @testing-library/jest-dom@5.14.1
+ @testing-library/react@11.2.7
+ @testing-library/user-event@12.8.3
+ web-vitals@1.1.2
added 43 packages from 86 contributors in 12.779s
150 packages are looking for funding
run `npm fund` for details
Removing template package using npm...
npm WARN @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining@7.15.4 requires a peer of @babel/core@^7.13.0 but none is installed. You must install peer dependencies yourself.
npm WARN tsutils@3.21.0 requires a peer of typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.3.2 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.3.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules\watchpack-chokidar2\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules\webpack-dev-server\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
removed 1 package in 6.779s
150 packages are looking for funding
run `npm fund` for details
Created git commit.
在package.json文件中加入依赖再试试，
"dependencies": {
"core-js": "^3.1.4",
}