SOURCE

Function.prototype.apply2 = function (context, ...args) {
    context = context || window
    context.fn = this;
    const result = context.fn(args)
    delete context.fn
    return result
}

let obj = {
    value: 2,
    test() {console.log(this.value)}
}
function test () {
    console.log(this.value)
}
test.apply2(obj);