Browser Extensions Development (Chrome & Edge) · 课时

动态规则与 declarativeNetRequest 调试

在运行时添加和更新规则，管理规则 ID 与优先级，并观察匹配到的请求以进行调试。

第 4 / 4 课13 个步骤

动态规则与 declarativeNetRequest 调试 是 CoddyKit 上的免费 Browser Extensions Development (Chrome & Edge) 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Browser Extensions Development (Chrome & Edge) 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Browser Extensions Development (Chrome & Edge) 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Static vs Dynamic Rules

declarativeNetRequest supports two rule kinds. Static rules ship in JSON files in the manifest. Dynamic rules are added at runtime and persist across restarts.

Dynamic rules let your extension adapt to user choices without an update.

Declaring the Permission

You need the declarativeNetRequest permission. For dynamic rules at runtime, that is all you require.

{
  "permissions": ["declarativeNetRequest"]
}

The Shape of a Rule

Each rule has an id, a priority, an action, and a condition. The condition decides which requests match.

{
  "id": 1,
  "priority": 1,
  "action": { "type": "block" },
  "condition": { "urlFilter": "ads.example.com" }
}

Adding Dynamic Rules

Use updateDynamicRules to add rules. Pass them in the addRules array.

chrome.declarativeNetRequest.updateDynamicRules({
  addRules: [{
    id: 1, priority: 1,
    action: { type: 'block' },
    condition: { urlFilter: 'tracker.com', resourceTypes: ['script'] }
  }]
})

Removing Rules by ID

The same call removes rules by listing their IDs in removeRuleIds. Adds and removes can happen together.

chrome.declarativeNetRequest.updateDynamicRules({
  removeRuleIds: [1]
})

Unique Rule IDs

Every dynamic rule needs a unique numeric id. Reusing an existing ID without removing it first causes an error.

const existing = await chrome.declarativeNetRequest.getDynamicRules()
const nextId = Math.max(0, ...existing.map(r => r.id)) + 1

Priorities Resolve Conflicts

When multiple rules match, priority decides which wins. Higher priority takes precedence; allow rules can override block rules at the same level.

{ "id": 2, "priority": 2, "action": { "type": "allow" }, "condition": { "urlFilter": "safe.com" } }

Session Rules

If you want rules that vanish when the browser closes, use updateSessionRules instead. They never persist to disk.

chrome.declarativeNetRequest.updateSessionRules({
  addRules: [tempRule]
})

Observing Matched Requests

For debugging, enable the feedback permission and listen to onRuleMatchedDebug to see which rule fired for each request.

chrome.declarativeNetRequest.onRuleMatchedDebug.addListener((info) => {
  console.log('Matched rule ' + info.rule.ruleId)
})

Inspecting Current Rules

Call getDynamicRules to list everything currently active. This is essential when a rule misbehaves and you need to confirm what is installed.

const rules = await chrome.declarativeNetRequest.getDynamicRules()
console.log(rules.length + ' active rules')

Staying Within Limits

There is a cap on the number of dynamic rules. Audit and remove stale rules instead of piling on, and group conditions where possible to stay efficient.

Quick Check

Test your dynamic rules knowledge.

在交互式课程中回答

Recap

You learned dynamic request rules:

Add and remove with updateDynamicRules
Keep IDs unique and use priority for conflicts
Use session rules for temporary state
Debug with onRuleMatchedDebug and getDynamicRules
Respect rule count limits

Runtime rules let your extension adapt without shipping an update.

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常见问题解答

「动态规则与 declarativeNetRequest 调试」课时是免费的吗？

是的 — 「动态规则与 declarativeNetRequest 调试」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Browser Extensions Development (Chrome & Edge) 课程的其余内容，请升级到 CoddyKit PRO。 Browser Extensions Development (Chrome & Edge) 课程共包含 4 节课。

「动态规则与 declarativeNetRequest 调试」这节课中我会学到什么？

在运行时添加和更新规则，管理规则 ID 与优先级，并观察匹配到的请求以进行调试。你通过在浏览器中直接运行的动手代码来练习 Browser Extensions Development (Chrome & Edge)，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Browser Extensions Development (Chrome & Edge) 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Browser Extensions Development (Chrome & Edge) 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「动态规则与 declarativeNetRequest 调试」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Browser Extensions Development (Chrome & Edge) 课中编写并运行代码吗？

能。每节 Browser Extensions Development (Chrome & Edge) 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

拦截网络请求
修改请求标头
重定向与重写 URL
动态规则与 declarativeNetRequest 调试

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