https://babeljs.io/
copied to the command line
prompt a warning. This file is missing package.json
npm the init -t
LS generated package.json then saw this document.
Then go babel installed
after the installation is complete, one more node_module directory. babel on the node_module installed in the directory inside.
Use 
together with the code in the file package.json
prompt error. From src to the lib directory, that is, you need both src and lib directories
, respectively, to create two directories are
all modular code in src below.
The following code motion all js file format to the src folder
are files in js src.
RUN Build execution npm
main.js into this. Then execute npm run build
Also you need to implement Part IV
Execute this command line
to create something of a .babelrc.
Inside write the code
to re-Build
main.js the lib changes
modify the index.html file. Inside main.js files under lib with.
An error require no definition.
The question now is, he became the import require. But it does not require. In nodejs which is running in the browser is not running
With webpack
webpack 100 times more than hard Babel
parcel
webpack too hard, so he invented the parcel was
executed npm install -g parcel-bundler
delete lib file members
to src following js files are moved out.
Delete src directory
of the current list of root directory are listed.
index.html or referenced within this document is main.js.
parcel index.html
View page
run success.
Page load js file
main.js actually two sentences
automatically packed js files saved
