覆盖父类实例(非静态)方法javascript

我的用例是React,但这是一个JavaScript问题.

我想通过使用子类来扩展componentWillMount的功能.我怎么能做到这一点？

class Super {
    componentWillMount() {
        doStuff()
    }
}
class Sub extends Super {
    componentWillMount() {
        super() // this doesn't work
        doMoreStuff()
    }
}

解决方法:

要使用的语法是：

super.componentWillMount()

从mdn开始：

The super keyword is used to call functions on an object’s parent.

The super.prop and super[expr] expressions are valid in any method definition in both classes and object literals.

Syntax

06001

演示：

class Super {
    componentWillMount() {
        console.log('parent')
    }
}

class Sub extends Super {
    componentWillMount() {
        super.componentWillMount()
        console.log('child')
    }
}

new Sub().componentWillMount();

标签：javascript,es6-class
来源： https://codeday.me/bug/20190622/1264142.html