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In this example:
var circle = {
radius : 9,
getArea : function()
{
return (this.radius * this.radius) * Math.PI;
}
};
from this page‘s Encapsulation topic, the getArea is private, how would be with it public?
That’s not JSON notation, that’s JavaScript object literal notation. (JSON is a subset of object literal notation. It doesn’t allow functions, requires double quotes, and doesn’t support octal or hex.)
getAreaisn’t private, anything can call it. The page you quoted is simply incorrect. If you want patterns for truly private methods in JavaScript, here’s a roundup with desciptions of the various trade-offs (including the memory cost of the Crockford model, which is the most common form).