Constructor # new DoubleArrow(positions) 钳击箭头 Parameters: Name Type Description positions Array 坐标数组，任意类型的坐标数组，最终转换为自定义Position数组对象 Author: xyj See: Position Extends Graphic Members # positions Type: Array # readonly positions 坐标数组对象 Type: string # readonly type 类型 Methods # addTo(layer) → {Graphic} 将实体加入图层 Parameters: Name Type Description layer Layer 图层 Overrides: Graphic#addTo See: Layer Returns: this - 当前实体对象 Type: Graphic # setLabel() → {AttackArrow} 设置文字 Returns: 当前对象，链式调用 Type: AttackArrow # setStyle() → {DoubleArrow} 设置样式 Returns: Type: DoubleArrow