How to change sprite at run time from a url?

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var image = new Image();
image.crossOrigin = “anonymous”;
image.onload = function () {
console.log(‘loaded image’);
var texture = new pc.Texture(self.app.graphicsDevice);
texture.setSource(image);

    if(self.isSprite){
        var sp = new pc.Sprite(self.app.graphicsDevice);
        sp.atlas = texture;
        self.entity.sprite.spriteAsset = sp;
    }
    else {
        var meshInstances = self.entity.model.meshInstances;
        for (var i = 0; i < meshInstances.length; ++i) { 
            var mesh = meshInstances[i];
            mesh.material.diffuseMap = texture;
            mesh.material.update();
        }
    }
};
image.src = this.url;

above code is working for changing the texture on a material how to do the same for sprite?