layer.classList < ClassList object>

A list of class attributed for the layer. Also contains methods to add, remove, toggle and check for classes. For a full reference, see this overview.
译：认为该层的类的列表。 还包含方法来添加、移除切换和检查类。为充分引用，请参阅本概述。

layerA = new Layer

# Add the class .red 
layerA.classList.add("red")

# Remove the class .red 
layerA.classList.remove("red")

# Toggle the class .red 
layerA.classList.toggle("red")

# See if the layer has class .red 
print layerA.classList.contains("red")
# Output: true