๐ธclass field
JS โฉ class โฉ definition โฉ class fields
class fields are defined on the instance, not on the prototype.
๐ MDN โฉ arrow functions used as methods
The class fields are initialized:
base class: before
constructor()
derived class: immediately after
super()
๐ ๆด่ฉณ็ดฐๅ งๅฎน๏ผ่ซ็๏ผ override class fields
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