question - object - adding method

Question

function person(name, age) {
this.name = name;
this.age = age;
this.changeName = function (name) {
this.name = name;
}
}

var p = new person("David", 21);
p.changeName("John");

document.write(p);// i changed p.name to p

i want output [john 21]
help me please

Answer 1

document.write(p.name + " " + p.age);

Answer 2

function person(name, age) {
this.name = name;
this.age = age;
this.changeName = function (name) {
this.name = name;
}
this.format = function (){
return "[" + this.name + " " + this.age + "]" ;
}
}

var p = new person("David", 21);
p.changeName("John");
document.write(p.format());
document.write(JSON.stringify(p));

you can use something like above your own format function, or you can also go for JSON.stringify() which will format object data accordingly.