DOM -- 小练习 · 前端知识 -- 学习整理

>[danger] ##### 倒计时案例 ~~~ <!DOCTYPE html> <html lang="en" style="height: 200%"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style></style> </head> <body> <div class="cls"></div> <script> // 倒计时用结束时间减去当前时间得到时间戳转换为倒计时 // 将结束时间规定到 00：00：00 const endDate = new Date() endDate.setHours(24) endDate.setMinutes(0) endDate.setSeconds(0) endDate.setMilliseconds(0) const cls = document.querySelector('.cls') setInterval(() => { const startDate = new Date() const time = Math.floor( (endDate.getTime() - startDate.getTime()) / 1000 ) const hours = Math.floor(time / 3600) const minute = Math.floor(time / 60) % 60 const second = time % 60 cls.textContent = `${hours}:${minute}:${second}` }, 1000) </script> </body> </html> ~~~