本文详细的介绍了防刷新考试倒计时组件 ，分享给大家，也给自己留个笔记，感兴趣的可以了解下

<!-- 考试倒计时组件 --><template> <div class="time"> <p>00:{{timerCount2}}:{{timerCount1}}</p> <button @click="reset">重新计时</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; }, // 重新计时 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); }, // 倒计时 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); //存储秒 } if (startTime2) { this.timeMinutes = startTime2; } else { this.timeMinutes = this.minutes; localStorage.setItem("startTime2", this.minutes); //存储分 } 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("考试时间到"); } 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() { // 退出后清除计时器 if (this.timer) { clearInterval(this.timer); } }};</script><style scoped>.time { color: #f72a3a; font-weight: bold; font-size: 26px;}</style>

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