HTML 服務:限制
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為避免向使用者提供惡意 HTML 或 JavaScript,Apps Script 會使用 iframe,將 HTML 服務網頁應用程式或 Google 文件、試算表和表單的自訂使用者介面放入沙箱。(在其他情況下,例如產生電子郵件內文時,HTML 服務不會使用沙箱)。沙箱會對用戶端程式碼設下限制。
沙箱模式
除了 IFRAME
以外,所有沙箱模式都已淘汰。使用舊版沙箱模式的應用程式現在會自動使用較新的 IFRAME
模式。如果您有使用舊版模式 (NATIVE
和 EMULATED
) 開發的指令碼,請按照遷移說明操作,確保指令碼在 IFRAME
模式下正常運作。
呼叫 setSandboxMode
方法現在不會產生任何影響。
IFRAME 模式的限制
IFRAME
沙箱模式是以 HTML5 的 iframe 沙箱功能為基礎,並使用下列關鍵字:
allow-same-origin
allow-forms
allow-scripts
allow-popups
allow-downloads
allow-modals
allow-popups-to-escape-sandbox
allow-top-navigation-by-user-activation
- 這個屬性只會為獨立指令碼專案設定。
allow-top-navigation
關鍵字可讓內容導覽至頂層瀏覽環境,但受到限制,且不會在沙箱中設為屬性。如需重新導向指令碼,請改為加入連結或按鈕,讓使用者採取行動。
設定連結目標屬性
在 IFRAME
模式中,您需要將連結目標屬性設為 _top
或 _blank
:
Code.js
function doGet() {
var template = HtmlService.createTemplateFromFile('top');
return template.evaluate().setSandboxMode(HtmlService.SandboxMode.IFRAME);
}
top.html
<!DOCTYPE html>
<html>
<body>
<div>
<a href="http://google.com" target="_top">Click Me!</a>
</div>
</body>
</html>
您也可以使用封閉網頁的 head 區段中的 <base>
標記,覆寫這項屬性:
<!DOCTYPE html>
<html>
<head>
<base target="_top">
</head>
<body>
<div>
<a href="http://google.com">Click Me!</a>
</div>
</body>
</html>
動態內容必須使用 HTTPS
「有效」內容 (例如指令碼、外部樣式表和 XmlHttpRequest) 必須透過 HTTPS 載入,而非 HTTP。
除非另有註明,否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權,程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間:2025-08-31 (世界標準時間)。
[null,null,["上次更新時間:2025-08-31 (世界標準時間)。"],[[["\u003cp\u003eApps Script utilizes iframes to sandbox HTML service web apps and custom interfaces for Google products, protecting users from malicious code.\u003c/p\u003e\n"],["\u003cp\u003eAll sandbox modes except \u003ccode\u003eIFRAME\u003c/code\u003e are sunset; existing scripts using older modes automatically transition to \u003ccode\u003eIFRAME\u003c/code\u003e, and developers should migrate their code accordingly.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eIFRAME\u003c/code\u003e sandbox mode, based on HTML5 iframe sandboxing, imposes limitations on client-side code with specific allowances and restrictions.\u003c/p\u003e\n"],["\u003cp\u003eTo redirect users in \u003ccode\u003eIFRAME\u003c/code\u003e mode, use links or buttons with \u003ccode\u003etarget="_top"\u003c/code\u003e or \u003ccode\u003e_blank"\u003c/code\u003e or utilize the \u003ccode\u003e<base>\u003c/code\u003e tag to override this behavior.\u003c/p\u003e\n"],["\u003cp\u003eActive content like scripts and external stylesheets within the sandboxed environment must be loaded over HTTPS to ensure security.\u003c/p\u003e\n"]]],[],null,["# HTML Service: Restrictions\n\nTo protect users from being served malicious HTML or JavaScript, Apps Script\nuses iframes to sandbox HTML-service web apps or custom user\ninterfaces for Google Docs, Sheets, and Forms. (The HTML service does not use a\nsandbox in other situations, like generating the body of an email.) The sandbox\nimposes limitations on client-side code.\n\nSandbox Mode\n------------\n\nAll sandbox modes are now sunset except for `IFRAME`. Apps using older sandbox\nmodes now use the newer `IFRAME` mode automatically. If you have scripts that\nwere developed using the older modes (`NATIVE` and `EMULATED`), you should\nfollow the [migration instructions](/apps-script/migration/iframe) to ensure\nthey function properly under the `IFRAME` mode.\n\nThe [`setSandboxMode`](/apps-script/reference/html/html-output#setSandboxMode(SandboxMode))\nmethod now has no effect when called.\n\nRestrictions in IFRAME mode\n---------------------------\n\nThe `IFRAME` sandbox mode is based on the\n[iframe sandboxing](https://html.spec.whatwg.org/#attr-iframe-sandbox) feature\nin HTML5, using the following keywords:\n\n- `allow-same-origin`\n- `allow-forms`\n- `allow-scripts`\n- `allow-popups`\n- `allow-downloads`\n- `allow-modals`\n- `allow-popups-to-escape-sandbox`\n- `allow-top-navigation-by-user-activation` - This attribute is only set for [stand-alone script projects](/apps-script/guides/standalone).\n\nThe `allow-top-navigation` keyword, which allows the content to navigate its\ntop-level browsing context, is restricted and not set as an attribute in the\nsandbox. If you need to redirect your script, add a link or a button for the\nuser to take action on instead.\n\n### Setting the link target attribute\n\nIn the `IFRAME` mode you need to set the link target attribute to either\n`_top` or `_blank`: \n\n### Code.js\n\n function doGet() {\n var template = HtmlService.createTemplateFromFile('top');\n return template.evaluate().setSandboxMode(HtmlService.SandboxMode.IFRAME);\n }\n\n### top.html\n\n \u003c!DOCTYPE html\u003e\n \u003chtml\u003e\n \u003cbody\u003e\n \u003cdiv\u003e\n \u003ca href=\"http://google.com\" target=\"_top\"\u003eClick Me!\u003c/a\u003e\n \u003c/div\u003e\n \u003c/body\u003e\n \u003c/html\u003e\n\nYou can also override this attribute using the `\u003cbase\u003e` tag within the head\nsection of the enclosing web page: \n\n \u003c!DOCTYPE html\u003e\n \u003chtml\u003e\n \u003chead\u003e\n \u003cbase target=\"_top\"\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv\u003e\n \u003ca href=\"http://google.com\"\u003eClick Me!\u003c/a\u003e\n \u003c/div\u003e\n \u003c/body\u003e\n \u003c/html\u003e\n\n### HTTPS required for active content\n\n[\"Active\" content](https://developer.mozilla.org/en-US/docs/Security/MixedContent#Mixed_active_content)\nlike scripts, external stylesheets, and XmlHttpRequests must be loaded over\nHTTPS, not HTTP."]]