Php + js does not work after several seconds of Countdown

Source: Internet
Author: User
Php + js does not move after countdown for a few seconds. There are two problems with the countdown code. after the refresh, the countdown is still quite smooth, but wait for half a minute, and the countdown starts and stops working. why? 2. click refresh after the page is disconnected. the webpage does not respond unless you turn the page off and re-open it, and then repeat the first question .. A few seconds after the countdown to php + js
There are two problems with the countdown code.
1. after the refresh, the countdown is still quite smooth, but wait for half a minute, and the countdown starts and stops working. why?
2. click refresh after the page is disconnected. the webpage does not respond unless you turn the page off and re-open it, and then repeat the first question ..

The code is as follows:
PHP code
  

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