模型与支持之间的单向通信

Question

In the fiddle below, I'd like Mo to be able to call Su but not the other way around.

How can I implement this. I don't want to use events. Just native functionality of JavaScript.

Models are the traditional models found in the MVC. Support contains support functions needed by the model to run.

Mo -> Su

http://jsfiddle.net/bkYcr/2/

Answer 1

If you don't want "anything else accessing Mo", you can make Mo private. It is done by making function Model into constructor.

$Frame.Model = function(model_object){
    var privateFunc = function() {
        //Private function of Model objects. Can access Su.
    }
    this.publicFunction = function() {
        //Public function of Model objects. Anyone can access this by Mo.publicFunction(). Also can access Su.
    }
}

This function is a CONSTRUCTOR. So to make Mo, do

Mo = new $Frame.Model();

Remember not to forget the new. Or else things get messed up. To prevent the "mess" (which happens because the this inside the constructor refers to window if you forget the new), do this:

$Frame.Model = function(model_object){

    if (!(this instanceof $Frame.Model))
        return new $Frame.Model();
    var privateFunc = function() {
        //Private function of Model objects. Can access Su.
    }
    this.publicFunction = function() {
        //Public function of Model objects. Anyone can access this by Mo.publicFunction()
    }
}