Can't assign this in constructor

This question already has an answer here:

How can I merge properties of two JavaScript objects dynamically? 55 answers

Why can't I assign a new value to “this” in a prototype function? 4 answers

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你可以用Object.assign方法扩展this ：

class Foo {
  constructor (props) {
    Object.assign(this, props);
  }
}

const foo = new Foo({ a: 1 });
console.log(foo.a); // 1

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Seeing your use of the spread operator, it looks like you're using a Stage 3 proposal for ECMAScript.

https://github.com/tc39/proposal-object-rest-spread

Try the Object.assign method:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

Object.assign(target, ...sources);

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