How to display seconds in countdown timer in js

How to implement a seconds display countdown timer in JavaScript: Create the variable seconds to store the seconds. Create a timer that calls the countdown function at 1 second intervals. In the countdown function, decrement the seconds and update the time in the HTML timer element. When the seconds reaches 0, clear the timer.

How to implement a seconds display countdown timer in JavaScript

Create variables and timers:

let seconds = 10; // 初始秒数 let timer = setInterval(countdown, 1000); // 以 1 秒间隔调用 countdown 函数

countdown Function:

function countdown() { seconds--; // 减少秒数 let time = `${seconds}s`; // 转换为 "s" 格式 document.getElementById("timer").innerHTML = time; // 更新 HTML 中的计时器元素 // 当秒数为 0 时，清除计时器 if (seconds <= 0) { clearInterval(timer); } }

HTML code:

Working principle:

1. Create variables and timers:Create a variablesecondsto store seconds, and use the setInterval function to create a countdown timer, which is called every 1 secondcountdownfunction.
2. countdown function:In thecountdownfunction, decrementsecondsby one and convert it to the string "s" format. The updated time is then displayed in the HTML in atimerelement.
3. Clear timer:Whensecondsreaches 0, use clearInterval to clear the timer and stop the countdown.

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