Does Node.js support let keyword? [duplicate]

问题:

This question already has an answer here:

• Does node.js support the 'let' statement? 5 answers

In Javascript 1.7 the let keyword introduces block scope. This is arguably the most needed feature of Javascript and I was wondering if Node.js supports it.

Part of my difficult in ascertaining this is Node runs Google's V8 engine, which comes from such and such standard and I don't know how these line up with the Javascript x.y version numbers.

回答1:

Yes, the let keyword is supported, provided you run Node with the --harmony flag. However, I wouldn't recommend using let in production software. (by the way, you could have found this answer via search, before you asked a new question)