JavaScript中的方法？

Question

So I made a JavaScript Object, which makes an element in the DOM, and what I use my methods for, is to for example play the audio, set the duration of the audio etc. However, a method that I made inside my object apparently doesn't exist. By the way, I'm new, so I don't really know what I did wrong... But here is my code:

function Audio(paramSource) {
    var object = document.createElement("audio");
    (...)
    function play() {
        object.play();
    };
    (...)
};

var myAudio = new Audio("http://tufda.net/space/limewire.mp3");
myAudio.play();

Thanks in advance :)!

Answer 1

Close, you need to assign it as a property to the object. Something like this:

function Audio(paramSource) {
    var object = document.createElement("audio");
    //...
    this.play = function() {
        object.play();
    };
    //...
};

A function can be declared like a variable, and for the Audio object to publicly expose it (instead of just being inside its own scope) you would simply set that variable to a property on this within that scope.

So in the above code, object is a variable internal to the scope of Audio and play is a property on Audio .

Answer 2

You can assign to the object the object var:

function Audio(paramSource) {
    this.object = document.createElement("audio");
    (...)
    this.play = function() {
        this.object.play();
    };
    (...)
};

var myAudio = new Audio("http://tufda.net/space/limewire.mp3");
myAudio.play();

By this way you can access to Audio.object from outside.