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
组件countdown.html代码
<div class="count-down">
<div class="title">
<h4>
{{title}}
</h4>
</div>
<div class="body">
<div class="content">
<div class="top">
{{hour}}
</div>
<div class="bottom">
小时
</div>
</div>
<div class="content">
<div class="top">
{{minute}}
</div>
<div class="bottom">
分钟
</div>
</div>
<div class="content">
<div class="top">
{{second}}
</div>
<div class="bottom">
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>