项目中遇到倒计时需求，考虑到以后在其他模块也会用到，就自己封装了一个组件。便于以后复用。
组件需求如下：
- 接收父级组件传递截止日期
- 接收父级组件传递标题
组件效果
变量
组件countdown.html代码
<div> <div> <h4> {{title}} </h4> </div> <div> <div> <div> {{hour}} </div> <div> 小时 </div> </div> <div> <div> {{minute}} </div> <div> 分钟 </div> </div> <div> <div> {{second}} </div> <div> 秒 </div> </div> </div> </div>
组件countdown.scss代码
.count-down{ width:100%; height:100px; background: rgba(0,0,0,0.5); padding: 2px 0; .body{ margin-top: 8px; .content{ width:29%; float: left; margin: 0 2%; .top{ font-size: 20px;; line-height: 30px; color: black; background: white; border-bottom: 2px solid black; } .bottom{ font-size: 14px; line-height: 20px; background: grey; } } } }
组件countdown.component.ts代码
import { Component, OnInit, Input, OnDestroy, AfterViewInit } from '@angular/core'; @Component({ selector: 'roy-countdown', templateUrl: './countdown.component.html', styleUrls: ['./countdown.component.scss'] }) export class CountdownComponent implements AfterViewInit, OnDestroy { // 父组件传递截止日期 @Input() endDate: number; // 父组件传递标题 @Input() title: string; // 小时差 private hour: number; // 分钟差 private minute: number; // 秒数差 private second: number; // 时间差 private _diff: number; private get diff() { return this._diff; } private set diff(val) { this._diff = Math.floor(val / 1000); this.hour = Math.floor(this._diff / 3600); this.minute = Math.floor((this._diff % 3600) / 60); this.second = (this._diff % 3600) % 60; } // 定时器 private timer; // 每一秒更新时间差 ngAfterViewInit() { this.timer = setInterval(() => { this.diff = this.endDate - Date.now(); }, 1000); } // 销毁组件时清除定时器 ngOnDestroy() { if (this.timer) { clearInterval(this.timer); } } }
使用方法demo.html
<roy-countdown title="距离考试还有：" [endDate]="endDate"></roy-countdown>