如何在 JavaScript 中将类变量初始化为空数组？

Question

I essentially just want to assign the default value of a class variable to an empty array.

I've tried the following, but did not have any luck:

class Test {
    constructor(myArray = []) {
        this.myArray = myArray;
    }
}

Obviously this doesn't work, as when I try to print Test.myArray, undefined is returned rather than an empty array.

Answer 1

You are trying to access Prototype, your class is initialized correctly, just do:

 class Test { constructor(myArray = []) { this.myArray = myArray; } } const t = new Test(); console.log(t.myArray)

new keyword means, that you are creating a new instance of the Test class.