uniapp小程序24小时倒计时

<view>{{countdown}}</view>

 

 data() {
            return {
                h:23,//时
                m:59,//分
                s:59,//秒
                countdown:'24:00:00',//倒计时
                timer:null,//重复执行
        },
onLoad(){
    this.timer = setInterval(()=>{
        this.timeCount()
    },1000)
},
methods:{
    //24小时倒计时
            timeCount(){
                --this.s;
                if(this.s<0){
                    --this.m;
                    this.s=59;
                }
                if(this.m<0){
                    --this.h;
                    this.m=59
                }
                if(this.h<0){
                    this.s=0;
                    this.m=0;
                }
                this.countdown = this.h+":"+this.m+":"+this.s
            },
}