vue These dependencies were not found: * core-js/modules/es.array.iterator in ./node

项目打包时出现了这种问题，是一个叫core-js的包出了问题；

These dependencies were not found:* core-js/fn/array/flat-map in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/promise/finally in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/string/pad-end in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/string/pad-start in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/string/trim-end in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/string/trim-start in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/fn/symbol/async-iterator in ./node_modules/@babel/polyfill/lib/noConflict.js
* core-js/library/fn/array/is-array in ./node_modules/@babel/runtime-corejs2/core-js/array/is-array.js
* core-js/library/fn/global in ./node_modules/@babel/polyfill/lib/index.js
* core-js/library/fn/parse-float in ./node_modules/@babel/runtime-corejs2/core-js/parse-float.js
* core-js/library/fn/parse-int in ./node_modules/@babel/runtime-corejs2/core-js/parse-int.jsTo install them, you can run: npm install --save core-js/fn/array/flat-map core-js/fn/promise/finally core-js/fn/string/pad-end core-js/fn/string/pad-start core-js/fn/string/trim-end core-js/fn/string/trim-start core-js/fn/symbol/async-iterator core-js/library/fn/array/is-array core-js/library/fn/global core-js/library/fn/parse-float core-js/library/fn/parse-int
ℹ ｢hot｣: webpack: Compiling Done

解决方法是
1.是版本的问题，要重新install一下

npm install core-js@3 --save# ornpm install core-js@2 --save

2.也有人给出了这种方法：（我用这种方法还是出现了些问题，如果上面那种方式没有解决你的问题，你可以再试试这种方式；或者两种方式都用，未尝不可。）

//在babel.config.js中添加presets: [ [ "@vue/app", { useBuiltIns: "entry" } ] ]

详情参考这里：
useBuiltIns
core-js module error

接下来：
你可能出现过这种问题，没有直接忽视；

ERROR  Failed to compile with 17 errors                                                                                                                   16:27:36error  in ./node_modules/vant/es/nav-bar/index.cssModule build failed (from ./node_modules/postcss-loader/src/index.js):
Error: Loading PostCSS Plugin failed: Cannot find module 'postcss-pxtorem'(@C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\.postcssrc.js)at load (C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\node_modules\postcss-load-config\src\plugins.js:28:11)at Object.keys.filter.map (C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\node_modules\postcss-load-config\src\plugins.js:53:16)at Array.map (<anonymous>)at plugins (C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\node_modules\postcss-load-config\src\plugins.js:52:8)at processResult (C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\node_modules\postcss-load-config\src\index.js:33:14)at config.search.then (C:\Users\1234Wu\Desktop\eMeetUser\emeet_usermanual\node_modules\postcss-load-config\src\index.js:94:14)@ ./node_modules/vant/es/nav-bar/index.css 4:14-143 14:3-18:5 15:22-151@ ./node_modules/vant/es/nav-bar/style/index.js@ ./src/main.ts@ multi (webpack)-dev-server/client?http://192.168.1.5:80/sockjs-node (webpack)/hot/dev-server.js ./src/main.tserror  in ./src/App.vue?vue&type=style&index=0&lang=less&Module build failed (from ./node_modules/postcss-loader/src/index.js):
Error: Loading PostCSS Plugin failed: Cannot find module 'postcss-pxtorem.....后面还有很多。

你看可以重新 install 一下找不到的那个插件（）；或者直接npm install 全部重新安装一下。因为我看到package.json中是有这些模块的，安装cli的时候他是已经安装好了的，不知道为什么，现在找不到了。重新npm install 一下就好了。

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