专栏目标
在vue和element UI联合技术栈的操控下,本专栏提供行之有效的源代码示例和信息点介绍,做到灵活运用。
(1)提供vue2的一些基本操作:安装、引用,模板使用,computed,watch,生命周期(beforeCreate,created,beforeMount,mounted, beforeUpdate,updated, beforeDestroy,destroyed,activated,deactivated,errorCaptured,components,)、 $root , $parent , $children , $slots , $refs , props, $emit , eventbus ,provide / inject, Vue.observable, $listeners, $attrs, $nextTick , v-for, v-if, v-else,v-else-if,v-on,v-pre,v-cloak,v-once,v-model, v-html, v-text, keep-alive,slot-scope, filters, v-bind,.stop, .native, directives,mixin,render,国际化,Vue Router等
(2)提供element UI的经典操作:安装,引用,国际化,el-row,el-col,el-button,el-link,el-radio,el-checkbox ,el-input,el-select, el-cascader, el-input-number, el-switch,el-slider, el-time-picker, el-date-picker, el-upload, el-rate, el-color-picker, el-transfer, el-form, el-table, el-tree, el-pagination,el-badge,el-avatar,el-skeleton, el-empty, el-descriptions, el-result, el-statistic, el-alert, v-loading, $message, $alert, $prompt, $confirm , $notify, el-breadcrumb, el-page-header,el-tabs ,el-dropdown,el-steps,el-dialog, el-tooltip, el-popover, el-popconfirm, el-card, el-carousel, el-collapse, el-timeline, el-divider, el-calendar, el-image, el-backtop,v-infinite-scroll, el-drawer等
本文章目录
- 专栏目标
- 应用场景
- 示例效果
- 示例源代码(共108行)
应用场景
vue项目中,有很多时候我们需要做倒计时相关的应用。如果是多个倒计时,需要做一个循环,下面这个示例是如何显示倒计时的方法。
示例效果
示例源代码(共108行)
/*
* @Author: 大剑师兰特(xiaozhuanlan),还是大剑师兰特(CSDN)
* @此源代码版权归大剑师兰特所有,可供学习或商业项目中借鉴,未经授权,不得重复地发表到博客、论坛,问答,git等公共空间或网站中。
* @Email: 2909222303@qq.com
* @weixin: gis-dajianshi
* @First published in CSDN
* @First published time: 2023-12-10
*/
<template>
<div class="djs-box">
<div class="topBox">
<h3>vue加载循环倒计时</h3>
<div>大剑师兰特, 还是大剑师兰特,gis-dajianshi</div>
</div>
<div class="dajianshi">
<div v-for="(item,index) in nowspec" :key="item.specId">
<p >
<span>倒计时:</span>
<span style="margin-left:5px;color:#A43534;font-weight:450">{{ timeChange(item.countDown)}}</span>
</p>
</div>
</div>
</div>
</template>
<script>
export default ({
data() {
return {
nowspec: [{
specId:1,
start: "2023-12-20 19:23:26",
countDown: 50
},
{ specId:2,
start: "2023-12-20 19:23:26",
countDown: 1000
},
],
timer: null,
}
},
created() {
if (this.timer) { //这一段是防止进入页面出去后再进来计时器重复启动
clearInterval(this.timer);
}
},
mounted() {
this.beginTimer();
},
methods: {
beginTimer() { //这个计时器是每秒减去数组中指定字段的时间
this.timer = setInterval(() => {
for (let i = 0, len = this.nowspec.length; i < len; i++) {
const item = this.nowspec[i];
if (item.countDown > 0) {
item.countDown = item.countDown - 1; //我这里后台返回的是秒数,如果是日期需要自己转换一下
}
}
}, 1000);
},
timeChange(countDown) {
var $that = this;
if (countDown < 0) {
clearInterval(setInterval(this.timeChange(countDown), 1000));
return "已经发射"
}else{
//求天时分秒 leftDate是毫秒
let leftSecond = $that.fillNumber(countDown % 60);
let leftMinute = $that.fillNumber((countDown / 60) % 60);
let leftHours = $that.fillNumber((countDown / (60 * 60)) % 24);
let leftDay = $that.fillNumber(countDown / (60 * 60) / 24);
return leftDay + " 天 " + leftHours + " 小时 " + leftMinute + " 分 " + leftSecond + " 秒 ";
}
},
fillNumber(num) {
let number = Math.floor(num); //向下取整
return number > 9 ? number : "0" + number;
},
}
})
</script>
<style scoped>
.djs-box {
width: 900px;
height: 600px;
margin: 50px auto;
border: 1px solid seagreen;
}
.topBox {
margin: 0 auto 0px;
padding: 10px 0;
background:purple;
color: #fff;
}
.dajianshi{
margin-top: 100px;
width: 100%;
height:400px;
}
</style>