时间倒计时操作
var time = 1800; //30分钟换算成1800秒
this.timer = setInterval(() => {
if (time > 0) {
time = time - 1;
var minute = parseInt(time / 60);
var second = parseInt(time % 60);
let title='倒计时:' + minute.toString().padStart(2,'0') + ':' + second.toString().padStart(2,'0')
} else {
clearInterval(this.timer)
}
}, 1000);

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