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
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<!-- 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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