修正

scripts/verify-sequence-defaults.mjs

@@ -74,4 +74,26 @@ if (module.ensureDefaultSequenceFrames(fixedResource)) {
   throw new Error('固定图片模式不应填充序列帧')
 }
 
-console.log('默认序列帧校验通过：15 FPS、yanhua 01-15 顺序、路径、资源名称、文件存在，且不会覆盖已有序列')
+const playbackResource = {
+  imageMode: 'sequence',
+  sequencePlayback: 'loop-forward',
+  sequenceStart: 'random',
+  sequenceFps: 10,
+  sequenceFrames: Array.from({ length: 4 }, (_, index) => ({ name: `${index}.png`, previewUrl: '', texture: null })),
+}
+const fixedStart = module.imageSequenceStartOffset({ ...playbackResource, sequenceStart: 'first' }, 42, 7)
+if (fixedStart !== 0) throw new Error('固定首帧不应产生随机偏移')
+const randomStart = module.imageSequenceStartOffset(playbackResource, 42, 7)
+if (randomStart !== module.imageSequenceStartOffset(playbackResource, 42, 7) || randomStart < 0 || randomStart >= 4) {
+  throw new Error('随机起始帧必须确定且位于序列范围内')
+}
+const variants = new Set(Array.from({ length: 32 }, (_, spawnId) => module.imageSequenceStartOffset(playbackResource, 42, spawnId)))
+if (variants.size < 2) throw new Error('随机起始帧未在不同粒子间产生变化')
+if (module.imageFrameState(playbackResource, 0).index !== 0) throw new Error('固定首帧应从第 0 帧开始')
+if (module.imageFrameState(playbackResource, 0, 3).index !== 3) throw new Error('正向播放应从随机偏移帧开始')
+const reverseResource = { ...playbackResource, sequencePlayback: 'loop-reverse' }
+if (module.imageFrameState(reverseResource, 0, 3).index !== 0) throw new Error('反向播放应从随机偏移帧反向开始')
+const onceResource = { ...playbackResource, sequencePlayback: 'once-hide' }
+if (module.imageFrameState(onceResource, 0.3, 2).visible) throw new Error('单次隐藏应按偏移后的时长结束')
+
+console.log('默认序列帧校验通过：15 FPS、yanhua 顺序、资源路径、固定/随机起始帧与四种播放方式')