Using this attribute to a server method makes that method available also on client side.
Server Side
[JSVisible]
public string ComputeAge(string name, int yearBorn, int yearNow)
{
int age = yearNow - yearBorn;
return name + " is " + age + " years old.";
}
Client Side
// instead of
AddParam("yearBorn", 1982);
AddParam("yearNow", 2006);
AddParam("name", "John");
alert(ob_post.post(null, "ComputeAge"));
// you can use
alert(ComputeAge("John", 1982, 2006));