class Animal{ constructor(){ this.name='miaomiao'; } getName(){ return this.name; } } class Cat extends Animal{ constructor(){ super(); this.name='haha'; } } var animal=new Animal(); var cat=new Cat(); console.log(animal.getName()); console.log(cat.getName());
关于类,子类和父类共享一个this,需要调用super( ),否则会报错
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