This problem actually comes from when analyzing the jQuery source code, I saw that var ret = jQuery.merge(this.constructor(), elems );, where this.constructor() returns The empty instance object created by the init method. Therefore, I am confused about the direction of this.
The following is the test code:

function Person() {
    this.name = 'ddadaa';
    console.log(this);
}
var p1 = new Person();
p1.constructor();        //  Person {name: "ddadaa"}
var p2 = p1.constructor;
p2();                    //打印的是window

Why is it that when constructor() is called directly here, the pointer of this changes and a new object is automatically created? Does the internal implementation of the constructor() method have an impact on this?