javascript – Reference of a method while creating the prototype

I feel a bit dump but there is something I don\’t understand (or even know if it\’s possible) about prototyping in JavaScript.

I\’d like to use a method while I\’m creating the prototype of my pseudo-class :

var Class = function() {}
Class.prototype = {
    a: function() {
        return \'ok\'
    }
  , z: Class.prototype.a() // I tried with `this`/`constructor`/etc.
} // TypeError: Object [object Object] has no method \'a\' the rest isn\'t evaluated
var test = new Class()
test.z

I know I can do it this way but I\’d like to know if I can still but all my method/properties in the Class.prototype declaration :

var Class = function() {}
Class.prototype.a = function() {
    return \'ok\'
}
Class.prototype.z = Class.prototype.a()
var test = new Class()
test.z // \"ok\"

Thanks.

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