Abstract
When you use this methods mixin, please keep in mind that the target Class you want mix must be inherited from EventEmitter
Readonly
The parent of event.
List is a parent of Base or Layer.
This field has the name $$parent declared, which keep consistent with /model/basic/Base.class
Rest
设置 mix 的配置项目,返回的值会直接挂在被 Mixed 的原型上
Optional
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When you use this methods mixin, please keep in mind that the target Class you want mix must be inherited from EventEmitter