OO Javascript。 物业发行

Question

I come from OOP languages (Java, C# and PHP). I'm just doing some OOP in Javascript and am seriously confused on how to define a property. The code below is based on a Mozilla code example, which is the same as what I'm working with. I've also included the way I thought properties should be declared, but don't seem to work.

var myExtension = {

    // This is how I thought it'd be done
this.instructionServers = new Array(
    "http://server.com/json.php",
),


init: function() {  
    // The event can be DOMContentLoaded, pageshow, pagehide, load or unload.  
    if(gBrowser) {
        gBrowser.addEventListener("DOMContentLoaded", this.onPageLoad,false);  
    }
},  

onPageLoad: function(aEvent) {  
    var doc = aEvent.originalTarget; // doc is document that triggered the event  
    var win = doc.defaultView; // win is the window for the doc  

    // Skip frames and iFrames
    if (win.frameElement) return;

    // Code removed
}  

Answer 1

You should have

var myExtension = {
    instructionServers: ["http://server.com/json.php"],

    // ...

};

Alternatively, you can also assign properties in JavaScript directly, as in

myExtension.instructionServers = ["http://server.com/json.php"];

This would make instructionServers an array property of myExtension . You can then get the value of the property with

myExtension.instructionServers

or

myExtension['instructionServers']

As an aside, note that in JavaScript you can use handy array literals.

['hello', 3]

is equivalent to the more verbose and discouraged

new Array('hello', 3)

Answer 2

var myExtension = {
        url: 'http://server.com/json.php',
        init: function() {
            alert( this.url );
        }
}

myExtension.init();

Technically init is a property itself, just a property of type function. To declare a string property simply set one the same way as above.

To reference that property inside of your object use

this

Answer 3

You are using the object notation (think JSON) so there is no "=". it should be :

instructionServers: ["http://server.com/json.php"],