047:vue加载循环倒计时 示例

2023-12-13 21:37:18

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第047个

查看专栏目录: VUE ------ element UI


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

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

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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>


文章来源:https://blog.csdn.net/cuclife/article/details/134912459
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