js中编程调用function

Question

To exercise in javascript I have decided to write call function myself(calling). But I can't understand why the following error takes place: Uncaught TypeError: Cannot set property 'calledfunct' of undefined at Function.calling..... Here is the code:

var alex={
    name:"alex",
    surname:"surname"
}
let nameyourself = function(){
    console.log(`${this.name} ${this.surname}`);
}


Function.prototype.calling=function(smth){
    smth.prototype.calledfunct=this;
    return smth.prototype.calledfunct();
}
nameyourself.calling(alex);

Answer 1

Inside of Function.prototype.calling , the parameter smth refers to alex , and alex doesn't have an attribute called prototype . Therefore, you are unable to set the property calledfunc of the undefined attribute prototype .

If you define a prototype attribute on alex this error should go away.

var alex={
    name:"alex",
    surname:"surname",
    prototype: {}
}