new fengmap.FMFlowLineMarkerLayer()
FMFlowLineMarkerLayer 是流线标注的图层，用于管理流线标注
Methods
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addMarker(marker)
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添加marker
Name Type Description markerObject 流线marker
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removeAll()
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移除所有marker
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removeMarker(marker){boolean}
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移除marker
Name Type Description markerObject 流线marker
Returns:
Type Description boolean