22 lines
1.1 KiB
Markdown
22 lines
1.1 KiB
Markdown
---
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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"
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mode: quick
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status: complete
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date: 2026-05-02
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---
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## Summary
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Completed quick task: Added a "尾首概率" (Tail-Head Probability) dialog to the history page.
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### Changes
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- `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
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- `application/admin/controller/History.php` — Added `tailHeadProb` endpoint + added to `$noNeedRight`
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- `application/admin/view/history/index.html` — Added toolbar button with `btn-tailheadprob` class
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- `public/assets/js/backend/history.js` — Added click handler + `showTailHeadProbabilityDialog()` with period selector (30/50/100/200)
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### Implementation details
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- Tail = num % 10 (个位), Head = floor(num / 10) (十位)
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- Only counts valid transitions (both numbers in 1-49 range)
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- Displays probability as percentage with period count and transition count
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