` → `#app` → `` if no selector matches. **No silent truncation** — full extracted text is returned. | | `content_length` | int | `content.length` — useful for caller-side truncation decisions | | `image_count` | int | Count of `` whose `src` is xiaoe-hosted and not a `data:` URI. No silent slice — counts the entire page. | Empty `content` (e.g. login expired, page renders an empty shell) raises `EmptyResultError` instead of returning a row with `content=''`. ### `catalog` | Column | Type | Notes | |--------|------|-------| | `ch` | int | 1-based chapter index | | `chapter` | string | Chapter title (or course name for column resources) | | `no` | int | 1-based section index within the chapter | | `title` | string | Section title | | `type` | string | Resource label: `图文` / `直播` / `音频` / `视频` / `专栏` / `大专栏`; unknown types pass through as the raw `String(t)` rather than being silently swallowed | | `resource_id` | string | Xiaoe resource identifier (`p_xxx` / `v_xxx` / `l_xxx` / `a_xxx` / `i_xxx`) | | `url` | string | Canonical playback / reading URL — `''` when xiaoe did not expose enough fields to construct one (no synthetic URL) | | `status` | string | `已完成` / `%` / `未学` for normal courses; `已完成` / `节` / `''` for column resources | ### `courses` | Column | Type | Notes | |--------|------|-------| | `title` | string | Course title from the card | | `shop` | string | Shop name (`shop_name`) or app name (`app_name`); empty when the Vue tree did not expose either | | `url` | string | Canonical course URL: `entry.h5_url` → `entry.url` → built from `app_id` + `resource_id` (column courses get `/v1/course/column/?type=3`, everything else gets `/p/course/ecourse/`); returns `''` when none of the three are available — never a synthetic partial URL | ## Validation Empty results raise `EmptyResultError`, never silent `[]` — for browser adapters this almost always indicates the cookie has expired or the URL is not a course page. The positional `url` argument is required for `content` / `catalog` / `detail` / `play-url`; missing `url` raises `ArgumentError` before any browser navigation happens. ## Prerequisites - Chrome running and **logged into** the target Xiaoe shop - [Browser Bridge extension](/guide/browser-bridge) installed ## Notes - `courses` starts from `study.xiaoe-tech.com` and matches purchased course cards back to Vue data to recover shop names and course URLs - `catalog` supports normal courses, columns, and big columns by reading Vuex / Vue component state after the course page loads - `play-url` uses a direct API path for video lessons and falls back to runtime resource inspection for live replays - Cross-shop course URLs are preserved, so you can take a URL from `courses` and pass it directly into `detail`, `catalog`, `play-url`, or `content` - `catalog`, `courses`, and `content` extract pure helpers (`typeLabel`, `buildItemUrl`, `chapterUrlPath`, `buildCourseUrl`, `pickContentText`, `countXiaoeImages`) that are unit-tested directly in `clis/xiaoe/xiaoe.test.js` — the in-page IIFEs embed those same functions via `${fn.toString()}` so the live and the test paths share one source of truth