How can I use javascript in codeforces

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How can I use javascript in codeforces

Revision en2, by 15927491671, 2017-07-28 10:22:22

I want to use readline to input,but it is always return a undefined value?Who can help me.

javascript, input

Revisions

	Rev.	Lang.	By	When	Δ	Comment
	en2		15927491671	2017-07-28 10:22:22	2	Tiny change: 'n help me.' -> 'n help me.I h'
	en1		15927491671	2017-07-28 10:20:05	126	Initial revision (published)