CDPSession

CDPSession 实例用于讨论原始 Chrome Devtools 协议：

¥The CDPSession instances are used to talk raw Chrome Devtools Protocol:

• 协议方法可以通过 session.send 方法调用。

  ¥protocol methods can be called with session.send method.

• 可以使用 session.on 方法订阅协议事件。

  ¥protocol events can be subscribed to with session.on method.

有用的链接：

¥Useful links:

• 有关 DevTools 协议的文档可以在这里找到：DevTools 协议查看器。

  ¥Documentation on DevTools Protocol can be found here: DevTools Protocol Viewer.

• DevTools 协议入门：https://github.com/aslushnikov/getting-started-with-cdp/blob/master/README.md

  ¥Getting Started with DevTools Protocol: https://github.com/aslushnikov/getting-started-with-cdp/blob/master/README.md

const client = await page.context().newCDPSession(page);
await client.send('Animation.enable');
client.on('Animation.animationCreated', () => console.log('Animation created!'));
const response = await client.send('Animation.getPlaybackRate');
console.log('playback rate is ' + response.playbackRate);
await client.send('Animation.setPlaybackRate', {
  playbackRate: response.playbackRate / 2
});

---

方法

¥Methods

detach

Added before v1.9 cdpSession.detach

从目标分离 CDPSession。一旦分离，CDPSession 对象将不会触发任何事件，也不能用于发送消息。

¥Detaches the CDPSession from the target. Once detached, the CDPSession object won't emit any events and can't be used to send messages.

用法

¥Usage

await cdpSession.detach();

返回

¥Returns

• Promise<void>#

---

send

Added before v1.9 cdpSession.send

用法

¥Usage

await cdpSession.send(method);
await cdpSession.send(method, params);

参数

¥Arguments

• method string#

协议方法名称。

¥Protocol method name.

• params Object (optional)#

可选方法参数。

¥Optional method parameters.

返回

¥Returns

• Promise<Object>#