这样的事情

app.factory('MyAudio', function() {
    function MyAudio(url){
        var song = new Audio();
        song.crossOrigin = "anonymous";
        song.src = url;

        this.source = context.createMediaElementSource(song);
        this.source.connect(context.destination);
    }

    MyAudio.prototype.play = function(){
        this.source.mediaElement.play();
    };

    return MyAudio;
});

app.controller("myAppCtrl", myMainFunction);
myMainFunction.$inject = ["$interval", "MyAudio"];
function myMainFunction($interval, MyAudio) {
    this.myAudio = new MyAudio('/some/url.mp3');
    this.myAudio.play();
    // controller stuff
}