IpcRendererEvent对象继承Event

• processId Integer - 发送该消息的渲染进程内部的ID
• frameId Integer - 发送该消息的渲染进程框架的ID（可能是iframe）
• sender WebContents - Returns the webContents that sent the message
• senderFrame WebFrameMain | null Readonly - The frame that sent this message. May be null if accessed after the frame has either navigated or been destroyed.