docs(quick): 完成尾首概率分析弹窗 quick task

2026-05-02 15:36:48 +08:00
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+---
+title: "在history页面新增一个弹窗，显示：下一期尾数与前一期尾数相同的概率、下一期首位与前一期首位相同的概率"
+mode: quick
+status: complete
+date: 2026-05-02
+---
+
+## Summary
+
+Completed quick task: Added a "尾首概率" (Tail-Head Probability) dialog to the history page.
+
+### Changes
+- `application/admin/model/History.php` — Added `getTailHeadProbability()` method that analyzes consecutive period transitions of the special code (num7), calculating the probability of tail (ones digit) and head (tens digit) remaining the same
+- `application/admin/controller/History.php` — Added `tailHeadProb` endpoint + added to `$noNeedRight`
+- `application/admin/view/history/index.html` — Added toolbar button with `btn-tailheadprob` class
+- `public/assets/js/backend/history.js` — Added click handler + `showTailHeadProbabilityDialog()` with period selector (30/50/100/200)
+
+### Implementation details
+- Tail = num % 10 (个位), Head = floor(num / 10) (十位)
+- Only counts valid transitions (both numbers in 1-49 range)
+- Displays probability as percentage with period count and transition count