ZH 这意味着有些用户将没有 FID 值，有些用户的 FID 值较低，而有些用户的 FID 值可能较高。
Преведи "fid" на Англиски
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EN This means some users will have no FID values, some users will have low FID values, and some users will probably have high FID values.
ZH 如需深入了解如何改进 FID，请参阅优化 FID。有关其他能够改进 FID 的单个性能技巧的进一步指导，请参阅：
EN For a deep dive on how to improve FID, see Optimize FID. For additional guidance on individual performance techniques that can also improve FID, see:
ZH 首次输入延迟 (FID) 是测量加载响应度的一个以用户为中心的重要指标，因为该项指标将用户尝试与无响应页面进行交互时的体验进行了量化，低 FID 有助于让用户确信页面是有效的。
EN First Input Delay (FID) is an important, user-centric metric for measuring load responsiveness because it quantifies the experience users feel when trying to interact with unresponsive pages—a low FID helps ensure that the page is usable.
ZH FID 是测量页面加载期间响应度的指标。因此，FID 只关注不连续操作对应的输入事件，如点击、轻触和按键。
EN FID is a metric that measures a page's responsiveness during load. As such, it only focuses on input events from discrete actions like clicks, taps, and key presses.
ZH 如上所述，FID 只测量事件处理过程中的"延迟"。FID 既不测量事件处理本身所花费的时间，也不测量浏览器在运行事件处理程序后更新用户界面所花费的时间。
EN As mentioned above, FID only measures the "delay" in event processing. It does not measure the event processing time itself nor the time it takes the browser to update the UI after running event handlers.
ZH FID 是一个只能进行实际测量的指标，因为该项指标需要真实用户与您的页面进行交互。您可以使用以下工具测量 FID。
EN FID is a metric that can only be measured in the field, as it requires a real user to interact with your page. You can measure FID with the following tools.
ZH 由于 FID 值的预期差异，您必须在报告 FID 时查看值的分布并关注较高的百分位数，这一点至关重要。
EN Due to the expected variance in FID values, it's critical that when reporting on FID you look at the distribution of values and focus on the higher percentiles.
ZH 虽然 FID 是一项实际指标（而灯塔是一个实验室指标工具），但改进 FID 的指导方向与改进总阻塞时间 (TBT)这项实验室指标的指导方向相同。
EN While FID is a field metric (and Lighthouse is a lab metric tool), the guidance for improving FID is the same as that for improving the lab metric Total Blocking Time (TBT).
ZH 首次输入延迟 (FID) 指标有助于衡量您的用户对网站交互性和响应度的第一印象。
EN The First Input Delay (FID) metric helps measure your user's first impression of your site's interactivity and responsiveness.
ZH 因为输入发生在浏览器正在运行任务的过程中，所以浏览器必须等到任务完成后才能对输入作出响应。浏览器必须等待的这段时间就是这位用户在该页面上体验到的 FID 值。
EN Because the input occurs while the browser is in the middle of running a task, it has to wait until the task completes before it can respond to the input. The time it must wait is the FID value for this user on this page.
ZH 换句话说，FID 侧重于RAIL 性能模型中的 R（响应度），而滚动和缩放与 A（动画）更为相关，因此这些操作的性能质量应该单独进行评估。
EN To put this another way, FID focuses on the R (responsiveness) in the RAIL performance model, whereas scrolling and zooming are more related to A (animation), and their performance qualities should be evaluated separately.
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|---|---|
| r | r |
ZH 您对 FID 的跟踪、报告和分析方式可能与您惯常使用的其他指标十分不同。下一节将说明相应的最佳做法。
EN How you track, report on, and analyze FID will probably be quite a bit different from other metrics you may be used to. The next section explains how best to do this.
ZH 不过，虽然 FID 只测量事件延时的"延迟"部分，但想要对事件生命周期进行更多跟踪的开发者可以使用事件计时 API来实现这一想法。如需更多详情，请参阅自定义指标的相关指导。
EN However, while FID only measure the "delay" portion of event latency, developers who want to track more of the event lifecycle can do so using the Event Timing API. See the guide on custom metrics for more details.
ZH 要在 JavaScript 中测量 FID，您可以使用事件计时 API。以下示例说明了如何创建一个PerformanceObserver来侦听first-input条目并记录在控制台中：
EN To measure FID in JavaScript, you can use the Event Timing API. The following example shows how to create a PerformanceObserver that listens for first-input entries and logs them to the console:
ZH 上述代码说明了如何将first-input条目记录在控制台中并计算延迟。但是，在 JavaScript 中测量 FID 要更为复杂。详情请见下文：
EN This code shows how to log first-input entries to the console and calculate their delay. However, measuring FID in JavaScript is more complicated. See below for details:
ZH API 会为在后台选项卡中加载的页面分发first-input条目，但在计算 FID 时应忽略这些页面。
EN The API will dispatch first-input entries for pages loaded in a background tab but those pages should be ignored when calculating FID.
ZH 如果页面在首次输入发生前转移到后台，API 也会分发first-input条目，但在计算 FID 时仍应忽略这些页面（只有当页面始终处于前台时才考虑输入）。
EN The API will also dispatch first-input entries if the page was backgrounded prior to the first input occurring, but those pages should also be ignored when calculating FID (inputs are only considered if the page was in the foreground the entire time).
ZH 当页面通过往返缓存恢复时，API 不会报告first-input条目，但在这些情况下应该测量 FID，因为这对用户来说是多次不同的页面访问体验。
EN The API does not report first-input entries when the page is restored from the back/forward cache, but FID should be measured in these cases since users experience them as distinct page visits.
ZH API 不会报告 iframe 中的输入，但要想正确测量 FID，您应该考虑这些输入。子框架可以使用 API 将这些输入的first-input条目报告给父框架来进行聚合。
EN The API does not report inputs that occur within iframes, but to properly measure FID you should consider them. Sub-frames can use the API to report their first-input entries to the parent frame for aggregation.
ZH 开发者不必记住所有这些细微差异，而是可以使用web-vitals JavaScript 库来测量 FID，库会自行处理这些差异（在可能的情况下）：
EN Rather than memorizing all these subtle differences, developers can use the web-vitals JavaScript library to measure FID, which handles these differences for you (where possible):
ZH // 当 FID 可用时立即进行测量和记录。
EN // Measure and log FID as soon as it's available.
ZH 您可以参考getFID)的源代码，了解如何在 JavaScript 中测量 FID 的完整示例。
EN You can refer to the source code for getFID) for a complete example of how to measure FID in JavaScript.
ZH 在某些情况下（例如跨域 iframe），FID 无法在 JavaScript 中进行测量。详情请参阅web-vitals库的局限性部分。
EN In some cases (such as cross-origin iframes) it's not possible to measure FID in JavaScript. See the limitations section of the web-vitals library for details.
ZH 要了解如何改进某个特定网站的 FID，您可以运行一次灯塔性能审计，并留心查看审计建议的各种具体机会。
EN To learn how to improve FID for a specific site, you can run a Lighthouse performance audit and pay attention to any specific opportunities the audit suggests.
ZH 这可以通过 Event Timing API（用于测量 FID）实现，因为它公开了事件生命周期中的许多时间戳，包括：
EN This is possible with the Event Timing API (which is used to measure FID) as it exposes a number of timestamps in the event lifecycle, including:
ZH Web 指标 Chrome 扩展程序： Web 指标 Chrome 扩展程序对给定页面的核心 Web 指标（LCP 最大内容绘制、FID 和 CLS）进行测量和报告。该工具旨在为开发者进行代码更改时提供实时性能反馈。
EN Web Vitals Chrome Extension: The Web Vitals Chrome extension measures and reports the Core Web Vitals (LCP, FID, and CLS) for a given page. This tool is intended to provide developers with real-time performance feedback as they make code changes.
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