Where is the error in javascript?

Question

css

var asa = {
   age:15,
  name:"gexam",
  color:"sev",
}
var bas = +prompt("mi ban", "");
document.write(asa.bas)

Answer 1

works like this:

var asa = {
  age: 15,
  name: "gexam",
  color: "sev"
}
var bas = prompt("mi ban", "");
document.write(asa[bas])

Answer 2

var asa = {
   age:15,
  name:"gexam",
  color:"sev",
}

Commas after the last value are not understood by older Internet Explorers.
Plus before prompt is not an error, but a cast to a number.

var bas = +prompt("mi ban", "");
document.write(asa.bas)

writing goes to the bas variable, and reading the bas property of the asa object

Answer 3

var asa = {
   age:15,
  name:"gexam",
  color:"sev",
}
asa.bas = prompt("mi ban", ""); // вроде так дожно быть
document.write(asa.bas) // Это неправильно, prompt это не текст чтобы в html пихать