How to implement call, apply and bind in native js

Function.prototype.mycall = function (context, ...args) {
    //Judge whether it is a function. If it is not a function, an error will be reported if (typeof this !== "function") {
        throw new Error("not a function");
    }
    context = context || window;
    context.fn = this;
    const res = context.fn(...args);
    delete context.fn;
    return res;
}

var name = "Li Hui", age = 25;
var obj = {
    name: "Zhou Guo",
    objAge: this.age,
    myFun: function (fm, to) {
        console.log(`name: ${this.name}, age: ${this.age}, from: ${fm}, to: ${to}`)
    }
};
var person = {
    name: "younger brother",
    age: 12,
};

Function.prototype.mycall = function (context, ...args) {
    //Judge whether it is a function. If it is not a function, an error will be reported if (typeof this !== "function") {
        throw new Error("not a function");
    }
    context = context || window;
    context.fn = this;
    const res = context.fn(...args);
    delete context.fn;
    return res;
}

obj.myFun.mycall(person, "Chengdu", "Renshou"); //Name: younger brother, age: 12, from: Chengdu, to: Renshou

Function.prototype.myApply = function (context, ...args) {
    //Judge whether it is a function. If it is not a function, an error will be reported if (typeof this !== "function") {
        throw new Error("not a function");
    }
    context = context || window;
    context.fn = this;
    args = args && args[0] || [];
    const result = context.fn(...args);
    delete context.fn;
    return result;
}

obj.myFun.myApply(person, ["Chengdu", "Renshou"]); //Name: younger brother, age: 12, from: Chengdu, to: Renshou

Function.prototype.myBind = function () {
    let self = this; //Save the original function let context = [].shift.call(arguments); //Save the this context that needs to be bound let args = [...arguments]; //Convert the remaining parameters passed in to an array return function () { //Return a new function self.apply(context,[].concat.call(args,[...arguments]));
    }
}

Function.prototype.myBind = function (context, ...args1) {
        return (...args2) => { //Return arrow function, this is bound to the function object that calls this method context = context || window;
            return this.apply(context, args1.concat(args2));//Merge parameters}
    }

Function.prototype.myBind = function (context, ...args1) {
    return (...args2) => { //Return arrow function, this is bound to the function object that calls this method context = context || window;
        context.fn = this;
        const args = args1.concat(args2);
        const res = context.fn(...args);
        delete context.fn;
        return res;
    }
}

obj.myFun.myBind(person, "Chengdu", "Renshou")(); //Name: younger brother, age: 12, from: Chengdu, to: Renshou