[BOM 基础](BOM%E5%9F%BA%E7%A1%80.md) [尺寸及坐标](%E5%B0%BA%E5%AF%B8%E5%8F%8A%E5%9D%90%E6%A0%87.md) [常用方法和事件](%E5%B8%B8%E7%94%A8%E6%96%B9%E6%B3%95%E5%92%8C%E4%BA%8B%E4%BB%B6.md)