Safari在iPhone上耗電較高的主要原因包括后臺(tái)活動(dòng)、未關(guān)閉的標(biāo)簽頁(yè)和內(nèi)容加載。首先，iOS允許Safari在后臺(tái)刷新內(nèi)容，即使切換到其他應(yīng)用也可能繼續(xù)加載頁(yè)面或腳本；其次，大量開啟的標(biāo)簽頁(yè)會(huì)占用內(nèi)存并增加功耗，建議關(guān)閉不需要的標(biāo)簽頁(yè)；第三，部分網(wǎng)站內(nèi)容如圖片、動(dòng)畫和自動(dòng)播放視頻（即使靜音）也會(huì)顯著消耗電池；此外，可啟用內(nèi)容攔截器或關(guān)閉“后臺(tái)應(yīng)用刷新”功能以減少負(fù)載；最后，JavaScript及擴(kuò)展程序同樣可能提升能耗，可臨時(shí)禁用不常用的擴(kuò)展以測(cè)試影響。

Safari on iPhone can sometimes use a surprising amount of battery, especially if you're not actively using it. The main reasons usually come down to background activity, open tabs, and content loading.

Background Refresh and Open Tabs

Even when you're not looking at Safari, it can still be working behind the scenes. iOS allows apps like Safari to refresh content in the background — this means it might be loading pages or scripts even when you've switched to another app.

• Too many open tabs can also slow things down. Safari keeps them all active as much as possible, which uses memory and power.
• Try closing tabs you don't need anymore. Swipe left or right on the tab view to close them quickly.

If you notice Safari is draining more battery than expected, start by reducing the number of open tabs and see if that helps.

Heavy Websites and Auto-Playing Media

Some websites are just heavier than others. Pages with lots of images, animations, or auto-playing videos can eat up battery fast — even if you didn't click "play."

• Sites often autoplay videos with sound muted, which still uses CPU and battery.
• Content blockers or ad blockers (if enabled) can help reduce this load.

You can also manually stop video playback by tapping into the tab and pausing the video — or just close those tabs entirely.

Background App Refresh Settings

iOS has a setting called “Background App Refresh” that lets apps update content even when they're not in use. Safari uses this feature to preload pages for faster access later, but it can cost extra battery.

To adjust this:

• Go to Settings > General > Background App Refresh
• Scroll down and find Safari
• Toggle it off if you want to limit background usage

This won't stop Safari from working normally when you're using it — it just stops it from doing extra work in the background.

JavaScript and Extensions

Modern websites rely heavily on JavaScript, which runs in the background and can keep your processor busy. If you use Safari extensions like ad blockers or password managers, these also run scripts that may increase power usage.

• You can disable extensions temporarily to test if they make a difference: go to Settings > Safari > Extensions
• Consider turning off any you don't use daily

Also, some sites will keep running scripts even when you're not interacting with them, so closing unused tabs helps here too.

Battery drain from Safari isn't always obvious, but it's usually tied to how many tabs you have open, what kind of content you're viewing, and how much background activity is happening. Keep an eye on your most-used sites and tweak settings where needed.基本上就這些。

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