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---
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name: "pixel-audit"
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displayName: "H5→MP 像素测量与 rpx 换算"
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description: "H5 页面结构化拆解、逐级元素测量、px→rpx 换算、偏差审计方法论。用于迁移前 H5 审计和迁移后双端对比。"
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keywords: ["rpx", "间距测量", "measure", "像素", "pixel", "px", "换算", "Tailwind", "wxss", "间距", "gap", "spacing", "审计", "拆解", "映射表", "偏差"]
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author: "NeoZQYY"
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---
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# H5→MP 像素测量与 rpx 换算
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精确测量 H5 页面元素尺寸与间距,换算为小程序 rpx 值。
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提供结构化拆解→逐级测量→偏差审计的完整方法论,指导 H5→MP 迁移和双端对比。
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核心工具:
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- `scripts/ops/measure_gaps.py`(Playwright headless 测量)
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- Playwright MCP `browser_evaluate`(等效 JS 测量)
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## rpx 速查
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```
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精确公式:rpx = ceil(px × 1.7442 / 2) × 2
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简化心算:rpx ≈ px × 2 × 0.875 取偶(6px/14px 处有 2rpx 偏差)
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圆角:border-radius = px × 2
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2→4 4→8 6→12 8→14 10→18 12→22
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14→26 16→28 20→36 24→42 28→50 32→56
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```
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## 偏差判定标准
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| rpx 偏差 | 级别 | 处理 |
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|----------|------|------|
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| ≤ 2rpx | 通过 | 无需修正 |
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| > 2rpx 且 ≤ 4rpx | 警告(P4-P7) | 像素级精调 |
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| > 4rpx | 不通过(P0-P3) | 必须修正 |
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## Steering
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| 文件 | 内容 |
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|------|------|
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| `measure.md` | 结构化拆解方法论、H5 审计映射表、逐级测量流程、偏差审计规则、rpx 换算公式与速查表、measure_gaps.py 用法、MP 反向验证 |
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加载:激活 Power → `readSteering("measure.md")`
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