在javascript中定义对象方法

Question

I want to make my custom object in javascript. I have made a method in my object to make value uppercase but it is not working. fiddle

function mystring (name,uppercase){
this.name= name;
this.uppercase= function (){
return this.toUpperCase();
};

}
var jj= new mystring('mycompany');
 jj=jj.uppercase();
console.log(jj)

Answer 1

You need to do

function mystring (name,uppercase){
    this.name= name;
    this.uppercase= function (){
        return this.name.toUpperCase();
    };

}
var jj= new mystring('mycompany');
jj=jj.uppercase();
console.log(jj);

You forgot the this.name in the this.uppercase function

Answer 2

You are trying to convert to the entire object to upper case, if you check the console it tells you that the element has no method toUpperCase . Instead convert the string, not the object.

return this.name.toUpperCase();