loader.js

loader = {
    // arreglo con ruta de las imágenes
    images: [],
    // Se ejecuta al cargar las imágenes
    onComplete: function(){},
    init: function(){

        
        var self = this, count = 0;
        
        var onLoadImage = function(src){
            
            console.log( 'load', count, src );
            count++;

            console.log(count, 'de', self.images.length)
            if (count >= self.images.length) {
                self.onComplete();
            };
        }
        self.images.forEach(function(src) {

            console.log(src);
            var img = new Image();
            img.src = src;
            img.onload = function(){ onLoadImage(src) };
        });
    },
}




/*
* Usage
*/
loader.images = [
    'http://peach.blender.org/wp-content/uploads/poster_bunny_big.jpg',
    'http://4.bp.blogspot.com/-gCfZrJ2WNCY/UDrTOp4ROcI/AAAAAAAABcQ/z93LCivcB-4/s1600/BigRock-4.jpg',
    'http://apod.nasa.gov/apod/image/9712/orionfull_jcc_big.jpg'
]
loader.onComplete = function(){
    console.log('done!')
}
loader.init();