扩展了LayerGroup，便于实现对其子图层的统一管理，如：
bindPopup binds a popup to all of the layers at once (likewise with bindTooltip)
Events are propagated to the FeatureGroup, so if the group has an event handler，因此FeatureGroup会处理来自子图层的鼠标事件和自定义事件、layeradd、layerremove
扩展了LayerGroup，便于实现对其子图层的统一管理，如：bindPopup binds a popup to...
Layer input layer output layer hidden layer is "activatio...
介绍 Caption layer Header layer Body layer Navigation layer...
CAGradientLayer *layer = [CAGradientLayer layer]; layer.s...
CAGradientLayer *layer = [CAGradientLayer layer]; layer.s...
CALayer *layer = [imageView layer];layer.shadowOffset = C...
Cocoa Touch Layer Media Layer Core Services Layer Core OS...
layer.cornerRadius layer.border string 1layer.border color
layer.cornerRadius：圆角设置 layer.borderWidth：边框宽度 layer.mask...
window.layer1 = layer
本文标题：Layer: FeatureGroup
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