node 8 doesn't seem to be supported, yet

[MartinP7r]

node-sass is not installing correctly and throwing errors. i found it very hard to find out the core of the problem, being that node-sass isn't supporting node > v7 yet. maybe you could make a note of that in your readme. just consider this an FYI and close if you see fit

[huguangju]

This is no problem. node-sass can work under node8.

I deleted the node_modules folder, then use nvm installed node 8 and switch over the past, the final implementation of npm i and npm run dev, there is no problem, you can access the browser in normal.

You have switched the node version in the middle, maybe you should rebuild it with --force (you can see the message in the error message):

npm rebuild node-sass --force