JavaScript text changing over time back and forth (ex.:1,2,3,2,1,2,3,2,1,2,3...)

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I need a JS to change a word three times every second, I found many info about it but I can't find out how to make it reversible... Basically I need this frame setting 1>2>3>2>1>2>3>2>1 and so on.

asked 1 min ago

XXX

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JavaScript text changing over time back and forth (ex.:1,2,3,2,1,2,3,2,1,2,3...)