js+html5 realizes page refreshable countdown effect

This article mainly introduces the countdown effect of js html5 to achieve page refresh in detail. It has certain reference value. Interested friends can refer to it.

Written a 5-minute countdown Code, sometimes the code needs to be refreshed, and then the countdown starts from 4:59 again. One solution I thought of is to use cache, set the start countdown time plus the 5 minutes to countdown as cache, and then use this directly The cache time minus the current time will keep counting down. No matter what you do during the countdown process, the time will always change, haha, that's the principle.

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