Why nodeJS was (slowly learning, slowly add)

Simply put Node.js is running on the server side JavaScript.

Node.js is an event-driven I / O server-side JavaScript environment,

Based on Google's V8 engine

2.nodeJS the similarities and differences with the javascript
with:
1. Based on ECMAscript syntax
different:
1.js have window object

Reproduced in: https: //www.jianshu.com/p/3dbee2b87512