Vue 封裝防重新整理考試倒計時元件的實現
阿新 • • 發佈:2020-06-05
本文詳細的介紹了防重新整理考試倒計時元件 ,分享給大家,也給自己留個筆記,感興趣的可以瞭解下
<!-- 考試倒計時元件 --> <template> <div class="time"> <p>00:{{timerCount2}}:{{timerCount1}}</p> <button @click="reset">重新計時</button> </div> </template> <script> export default { name: "Time",data() { return { timeSeconds: 0,timeMinutes: 0,seconds: 59,// 秒 minutes: 1,// 分 timer: null }; },methods: { num(n) { return n < 10 ? "0" + n : "" + n; },// 重新計時 reset() { sessionStorage.removeItem("answered"); window.location.reload(); localStorage.removeItem("startTime1"); localStorage.removeItem("startTime2"); clearInterval(this.timer); },// 清除 clear() { localStorage.removeItem("startTime1"); localStorage.removeItem("startTime2"); sessionStorage.setItem("answered",1); clearInterval(this.timer); },// 倒計時 timing() { let [startTime1,startTime2] = [ localStorage.getItem("startTime1"),localStorage.getItem("startTime2") ]; let nowTime = new Date().getTime(); if (startTime1) { let surplus = this.seconds - parseInt((nowTime - startTime1) / 1000); this.timeSeconds = surplus <= 0 ? 0 : surplus; } else { this.timeSeconds = this.seconds; localStorage.setItem("startTime1",nowTime); //儲存秒 } if (startTime2) { this.timeMinutes = startTime2; } else { this.timeMinutes = this.minutes; localStorage.setItem("startTime2",this.minutes); //儲存分 } this.timer = setInterval(() => { if ( this.timeSeconds == 0 && this.timeMinutes != 0 && this.timeMinutes > 0 ) { let nowTime = new Date().getTime(); this.timeSeconds = this.seconds; localStorage.setItem("startTime1",nowTime); this.timeMinutes--; localStorage.setItem("startTime2",this.timeMinutes); } else if (this.timeMinutes == 0 && this.timeSeconds == 0) { this.timeSeconds = 0; this.clear(); alert("考試時間到"); } else { this.timeSeconds--; } },1000); } },mounted() { if (sessionStorage.getItem("answered") != 1) { this.timing(); } },computed: { timerCount1() { return this.timeSeconds < 10 ? "0" + this.timeSeconds : "" + this.timeSeconds; },timerCount2() { return this.timeMinutes < 10 ? "0" + this.timeMinutes : "" + this.timeMinutes; } },destroyed() { // 退出後清除計時器 if (this.timer) { clearInterval(this.timer); } } }; </script> <style scoped> .time { color: #f72a3a; font-weight: bold; font-size: 26px; } </style>
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