1/
var timer = null;
var t = videoArr[i].aswTime;
// console.log('答题时长：',t)
var m = 0;
var s = 0;
m = Math.floor(t / 60 % 60);
m < 10 && (m = '0' + m);
s = Math.floor(t % 60);
function countDown() {
s--;
s < 10 && (s = '0' + s);
if (s.length >= 3) {
s = 59;
m = "0" + (Number(m) - 1);
}
if (m.length >= 3) {
m = '00';
s = '00';
clearInterval(timer);
}
console.log(m + "分钟" + s + "秒");
2/
page({
data:{
nextTimer: '',//5s定时器名字
countDownNum: '5',//倒计时初始值
}
})
//在你需要用到的地方，调用
this.countDown()
//倒计时函数
countDown: function () {
let that = this;
that.setData({
countDownNum: '5'
})
let countDownNum = that.data.countDownNum;//获取倒计时初始值
//如果将定时器设置在外面，那么用户就看不到countDownNum的数值动态变化，所以要把定时器存进data里面
that.setData({
nextTimer: setInterval(function () {//这里把setInterval赋值给变量名为timer的变量
//每隔一秒countDownNum就减一，实现同步
countDownNum--;
that.setData({
countDownNum: countDownNum
})
if (countDownNum == 0) {
clearInterval(that.data.nextTimer);
}
}, 1000)
})
},
拓展：
