为什么这个名为method的构造函数返回一个对象?

const data = "This is a title";


class Foo {
  constructor(data) {
    this._title = data;
    this.createText();
  }

  createText() {
    return `<h1> ${this._title} </h1>`;
  }
}

const targ = document.getElementById('targ');

//Why doesn't this work considering it's called in the constructor?
targ.innerHTML = new Foo(data);

targ.innerHTML += new Foo(data).createText();

<div id="targ"></div>