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⚡ Bolt: cache Intl formatters and DOM refs in index.html #54

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⚡ Bolt: cache Intl formatters and DOM refs in index.html #54

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Empty file added .jules/bolt.md
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45 changes: 27 additions & 18 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -481,28 +481,37 @@ <h1>🌟 人生明燈</h1>
}

// 時間工具
// Performance Optimization: Cache Intl.DateTimeFormat instances (~25-100x faster than toLocaleString)
const timeFormatter = new Intl.DateTimeFormat('zh-TW', { hour: 'numeric', minute: 'numeric', second: 'numeric' });
const dateFormatter = new Intl.DateTimeFormat('zh-TW', { year: 'numeric', month: 'long', day: 'numeric', weekday: 'long' });
const tokyoFormatter = new Intl.DateTimeFormat('ja-JP', { timeZone: 'Asia/Tokyo', hour: 'numeric', minute: 'numeric', second: 'numeric' });
const nyFormatter = new Intl.DateTimeFormat('en-US', { timeZone: 'America/New_York', hour: 'numeric', minute: 'numeric', second: 'numeric' });
const londonFormatter = new Intl.DateTimeFormat('en-GB', { timeZone: 'Europe/London', hour: 'numeric', minute: 'numeric', second: 'numeric' });

let cachedTimeDiv, cachedTimeZonesDiv;

function updateTime() {
const now = new Date();
const timeDiv = document.getElementById('currentTime');
const timeZonesDiv = document.getElementById('timeZones');
// Performance Optimization: Cache DOM references to avoid repeated lookups
if (!cachedTimeDiv) cachedTimeDiv = document.getElementById('currentTime');
if (!cachedTimeZonesDiv) cachedTimeZonesDiv = document.getElementById('timeZones');

timeDiv.innerHTML = `
<div class="temp">${now.toLocaleTimeString('zh-TW')}</div>
<div>${now.toLocaleDateString('zh-TW', {
year: 'numeric',
month: 'long',
day: 'numeric',
weekday: 'long'
})}</div>
`;
if (cachedTimeDiv) {
cachedTimeDiv.innerHTML = `
<div class="temp">${timeFormatter.format(now)}</div>
<div>${dateFormatter.format(now)}</div>
`;
}

timeZonesDiv.innerHTML = `
<small>
東京: ${now.toLocaleTimeString('ja-JP', {timeZone: 'Asia/Tokyo'})}<br>
紐約: ${now.toLocaleTimeString('en-US', {timeZone: 'America/New_York'})}<br>
倫敦: ${now.toLocaleTimeString('en-GB', {timeZone: 'Europe/London'})}
</small>
`;
if (cachedTimeZonesDiv) {
cachedTimeZonesDiv.innerHTML = `
<small>
東京: ${tokyoFormatter.format(now)}<br>
紐約: ${nyFormatter.format(now)}<br>
倫敦: ${londonFormatter.format(now)}
</small>
`;
}
}

// 實用函數
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