ubuntu20.04配置typescript遇到的一个问题以及解决方法

[SSK015]

https://ssk015.github.io/problemintypescriptconfig/

这几天心血来潮，想学typescript。先要配它的环境，在我的ubuntu20.04虚拟机上配环境。用apt-get工具分别以-g命令下载nodejs和npm之后，用tsc编译.ts文件时出现以下报错：

xyw@ubuntu:~/Documents/Code/Learning-typescript-from-scratch/src$ tsc hello.ts
/usr/local/lib/node_modules/typescript/lib/tsc.js:93
for (let i = startIndex ?? 0; i < array.length; i++) {
^

SyntaxError: Unexpected token ?
at Module._compile (internal/modules/cjs/loader.js:723:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (/usr/local/lib/node_modules/typescript/bin/tsc:2:1)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)

尝试用npm重新安装typescript，出现以下报错:

root@ubuntu:/home/xyw/Documents/Code# npm install -g typescript
[..................] / rollbackFailedOptional: verb npm-session 072b7b0747965df0
[..................] / rollbackFailedOptional: verb npm-session 072b7b0747965df0
/usr/local/bin/tsc -> /usr/local/lib/node_modules/typescript/bin/tsc
/usr/local/bin/tsserver -> /usr/local/lib/node_modules/typescript/bin/tsserver
npm WARN notsup Unsupported engine for [email protected]: wanted: {