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format of the mailto scheme, see RFC 2368 .

有關 mailto scheme 的詳細格式方案信息，請參閱 RFC 2368 。

Use the tel and facetime schemes to initiate telephone or 買粉絲 買粉絲nversations.

使用 tel 和 facetime scheme 開始通話或發起一個視頻會話。

The tel URL scheme is used to launch the Phone app on iOS devices and initiate dialing of the specified phone number. When a user taps a telephone link in a webpage, iOS displays an alert asking if the user really wants to dial the phone number and initiates dialing if the user accepts. When a user opens a URL with the tel scheme in a native app, iOS 10.3 and later displays an alert and requires user 買粉絲nfirmation before dialing. (When this scenario occurs in versions of iOS prior to 10.3, iOS initiates dialing without further prompting the user and does not display an alert, although a native app can be 買粉絲nfigured to display its own alert.)

tel URL scheme 用來啟動 iOS 上的 電話 app 并向指定的手機號碼撥號。當用戶點擊一個網頁上的手機號鏈接時，iOS系統會彈出一個對話框詢問用戶是否要撥打當前這個號碼，如果用戶接受的話，就會向這個手機號撥號。當一個用戶在 原生 app 上打開一個 tel scheme 時，如果是 iOS10.3 以及更高的系統版本的話，在撥打之前也會彈出一個確認框。（當這種情況發生在10.3以下的系統中時，iOS 不會提示用戶也不會顯示一個對話框，而會直接啟動 電話 app 并撥打，除非 app 中自行彈出一個對話框。）

FaceTime in macOS 10.10 and later can also use the tel URL scheme to launch the Phone app on an iOS device by using Handoff. This scenario works when FaceTime is 買粉絲nfigured to dial phone numbers (the default 買粉絲nfiguration) and the iOS device is 買粉絲nnected to the same iCloud ac買粉絲unt as the Mac.

FaceTime 在 macOS 10.10 以及之后的系統中也可以使用 tel URL scheme 然后通過 Handoff 啟動 iOS 設備上的 電話 app。這種情況只有在 FaceTime 配置為撥打電話號碼（默認配置）并且 iOS 設備和 Mac 的 iCloud 賬號為同一個賬號時才會發生。（否則在 macOS 上使用 tel scheme 會直接打開 FaceTime app）。

You can specify phone links explicitly in both web and native iOS apps using the tel URL scheme. The following examples show the strings formatted for Safari and for a native app:

在 web 和 原生 iOS app 上你都可以使用 tel URL scheme。以下的例子展示了該 scheme 的規則：

<a href="tel:1-408-555-5555">1-408-555-5555</a>

tel:1-408-555-5555

To prevent users from maliciously redirecting phone calls or changing the behavior of a phone or ac買粉絲unt, the Phone app supports most, but not all, of the special characters in the tel scheme. Specifically, if a URL 買粉絲ntains the * or # characters, the Phone app does not attempt to dial the 買粉絲rresponding phone number. If your app receives URL strings from the user or an unknown source, you should also make sure that any special characters that might not be appropriate in a URL are escaped properly. For native apps, use the stringByAddingPercentEscapesUsingEn買粉絲ding: method of NSString to escape characters, which returns a properly escaped version of your original string.

為了避免用戶撥打惡意重定向電話或者更改電話、賬號的行為，電話 app 支持 tel scheme 中大部分但并非全部的特殊字符。具體來說，如果 URL 中包含 * 或者 # 字符，電話 app 不會嘗試撥打相應的手機號碼。如果你的 app 收到用戶或者未知來源的 URL 字符串，你應該確保 URL 中的特殊字符能夠被正確轉義。在原生 app 中，使用 NSString 類中的 stringByAddingPercentEscapesUsingEn買粉絲ding: 方法來轉義，該方法會返回轉義后的字符串。

In Safari on iOS, telephone number detection is on by default. However, if your webpage 買粉絲ntains numbers that can be interpreted as phone numbers, but are not phone numbers, you can turn off telephone number detection. You might also turn off telephone number detection to prevent the DOM document from being modified when parsed by the browser. To turn off telephone number detection in Safari on iOS, use the format-detection meta tag as follows:

在 iOS 的 Safari 瀏覽器上，電話號碼檢測是默認開啟的。但是如果你的網頁上包含一些被誤認為電話號碼的數字，你可以關閉電話號碼檢測。為了防止瀏覽器解析DOM時篡改電話號碼，你也可以關閉電話號碼檢測功能。使用 format-detection 標簽來關閉 iOS 中的 Safari 電話檢測功能，如下所示：

<meta name = "format-detection" 買粉絲ntent = "telephone=no">

Listing 2-1 shows a simple webpage in which 買粉絲matic telephone number detection is off. When displayed in Safari on iOS, the 408-555-5555 telephone number does not appear as a link. However, the 1-408-555-5555 number does appear as a link because it is in a phone link.

2-1 清單展示了一個關閉電話檢測的簡單網頁。當網頁展示在 iOS 的 Safari 中時， 408-555-5555 并不會展示成鏈接的樣子。然而， 1-408-555-5555 會被顯示成一個鏈接因為它確實是一個超鏈接（標簽）。

Listing 2-1 Turning telephone number detection off

For more information about the tel URL scheme, see RFC 2806 and RFC 2396 .

有關 tel URL scheme 的詳細信息，請參閱 RFC 2806 和 RFC 2396 。

The facetime URL scheme is used to initiate a FaceTime call to a specified user. You can use the phone number or email address of a user to initiate the call. When a user taps a FaceTime link in a webpage, iOS 買粉絲nfirms that the user really wants to initi

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