我正在使用 astro 和 preact。我希望这张卡每秒渲染并更新其计数器。它应该显示您有多久没有吸烟了。我在本地存储中存储了一个开始日期。当我尝试通过 js 脚本执行此操作时,它似乎有效。但是当我想使用 useEffect() 钩子时,计时器就会卡在 0 处。
index.astro
---
import 'bootstrap-icons/font/bootstrap-icons.css';
import BaseLayout from '../layouts/BaseLayout.astro';
import FunFact from '../components/FunFact.astro';
import Card from '../components/Card';
import SmokeFreeTimeCard from '../components/SmokeFreeTimeCard';
const pageTitle = "Übersicht";
---
<BaseLayout pageTitle={pageTitle}>
<Card cardTitle="Funfact" iconClass="fa-regular fa-face-laugh">
<FunFact />
</Card>
<SmokeFreeTimeCard cardTitle="Rauchfreie Zeit" iconClass="fa-solid fa-ban-smoking">
</SmokeFreeTimeCard>
<Card cardTitle="Finanzen" iconClass="fa-solid fa-money-bill">
Du hast bereits <b>X€</b> gespart!<br/>
Dein jähliches Ersparnis beläuft sich auf <b>XXXX€</b>. Das sind <b>XXX€</b> im Monat bzw. <b>XX€</b> am Tag!
</Card>
<Card cardTitle="Konsum" iconClass="fa-solid fa-wand-magic-sparkles">
Du hast bereits <b>XX,XX Zigaretten</b> widerstanden.<br/>
Auf ein Jahr gerechnet sind das <b>XX.XXX Stück</b>
</Card>
<script>
import "../scripts/index.js";
</script>
</BaseLayout>
卡.jsx
import 'bootstrap/dist/css/bootstrap.min.css';
import '@fortawesome/fontawesome-free/css/all.min.css';
const Card = ({ cardTitle, iconClass, children }) => (
<div class="card" style={{ marginBottom: '20px' }}>
<div class="card-header" style={{ color: '#ACEB98' }}>
<i class={iconClass}></i> <b>{cardTitle}</b>
</div>
<div class="card-body">
<p class="card-text">
{children} {/* Hier werden die eingefügten Texte gerendert */}
</p>
</div>
</div>
);
export default Card;
SmokeFreeTimeCard.jsx
import { useState, useEffect } from 'preact/hooks';
import Card from '../components/Card';
const SmokeFreeTimeCard = ({ cardTitle, iconClass }) => {
const [timeElapsed, setTimeElapsed] = useState(0);
useEffect(() => {
const interval = setInterval(() => {
const dateOfReturn = localStorage.getItem('dateOfReturn');
console.log('Date of Return:', dateOfReturn); // Überprüfe das Datum im localStorage
if (dateOfReturn) {
const startDate = new Date(dateOfReturn);
const currentDate = new Date();
const elapsedMilliseconds = currentDate - startDate;
console.log('Elapsed Milliseconds:', elapsedMilliseconds); // Überprüfe die vergangene Zeit
setTimeElapsed(elapsedMilliseconds);
}
}, 1000);
return () => clearInterval(interval);
}, []);
const formatTime = (milliseconds) => {
const seconds = Math.floor(milliseconds / 1000);
const hours = Math.floor(seconds / 3600);
const minutes = Math.floor((seconds % 3600) / 60);
const remainingSeconds = seconds % 60;
return `${hours} Stunden ${minutes} Minuten ${remainingSeconds} Sekunden`;
};
return (
<Card cardTitle={cardTitle} iconClass={iconClass}>
{typeof timeElapsed === 'number' && (
<>Du bist <b>{formatTime(timeElapsed)}</b> rauchfrei! Weiter so!</>
)}
</Card>
);
};
export default SmokeFreeTimeCard;
据我研究,我发现任何与浏览器相关的 API(文档和窗口)在 Astro 中都无法访问。由于
localStorage
也是`window的一部分,因此astro无法直接访问它。
由于 Astro 组件运行在服务器上,因此我们无法访问这些浏览器特定的对象。
客户端指令来说明何时加载它。
为此,您只需将 client:load
<SmokeFreeTimeCard
cardTitle="Rauchfreie Zeit"
iconClass="fa-solid fa-ban-smoking"
client:load
/>
另一种解决方案可能是使用您提到的旧经典script
。正如 Astro 文档中提到的:如果代码位于 Astro 组件中,请将其移至 frontmatter 之外的标签。这告诉 Astro 在文档和窗口可用的客户端上运行此代码。