如何判断哪个版本的javascript chrome dev工具正在运行？

Question

You would say, "Well it's running the according version to the version of Chrome you're running of course!", but is there a way to see/set what version of javascript you're working with in Chrome Dev Tools?

I ask becuase I was trying to follow along with MDN's const example but const wasn't working as expected in the Chrome Dev Tools Console.

I'm on Chrome Version 49.0.2623.108 m and have some experimental settings checked.

Me trying to use const in the Chrome Dev Tools Console:

const MY_FAV = 7;
undefined
MY_FAV
VM202:2 Uncaught ReferenceError: MY_FAV is not defined(…)(anonymous function) @ VM202:2InjectedScript._evaluateOn @ VM134:878InjectedScript._evaluateAndWrap @ VM134:811InjectedScript.evaluate @ VM134:667
MY_FAV = 20;
20
MY_FAV
20

I was writing other ES6 things in the console earlier today like ...args so not sure why const is acting like this right now.

Answer 1

is there a way to see/set what version of javascript you're working with in Chrome Dev Tools?

Whatever your browser's engine is implementing, really.

The best you can see is probably the name and version of your browser's JavaScript engine at chrome://version/ , which you can then cross-reference with the issue tracker, filtered by version label .

If you're asking whether certain features are implemented, you're probably best off looking at compatibility tables or searching for the specific features in the issue tracker or other databases .