默认安装node之后，在运行javascript代码时使用的是commonjs方式，比如如下代码
import chalk from 'chalk'
console.log(chalk.red('helllo'));
直接运行会出错：
D:\studyTS\StudySnippet>node ownSnippet.js
(node:27268) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
D:\studyTS\StudySnippet\ownSnippet.js:2
import chalk from 'chalk'
^^^^^^
SyntaxError: Cannot use import statement outside a module
at wrapSafe (internal/modules/cjs/loader.js:979:16)
at Module._compile (internal/modules/cjs/loader.js:1027:27)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
at internal/main/run_main_module.js:17:47
解决办法和你node.js版本有关，如果是低于13.2.0，需要两步：
- 在package.json中添加属性："type": "module"
- 在执行命令中添加如下选项：node --experimental-modules src/index.js
{
"type": "module",
"scripts": {
"start": "node --experimental-modules index.js"
}
}
如果版本大于13.2.0， 那么只需要一步即可！即添加属性"type": "module"，比如
{
"devDependencies": {
"chalk": "^4.1.1"
},
"type": "module"
}
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