内包含计时功能的计时器，时间精确到秒，可以实现多次计时，同时可以显示当前的时间，精确到秒-Contains timing function timer, time accurate to seconds, you can achieve multiple timing, and can display the current time, accurate to the second

在浏览器内部加入了计时功能，可以设置截止时间，自动计时，精确到秒。-Added within the browser timing function, you can set a deadline, automatic timing, accurate to the second.