About Instantiating

I have a prefab "A" in my Project pane and have no corresponding gameobjects in Hierarchy pane.

Now, I want to just using JS code to implement Creating "A" in my scene.

Can anyone tell me how I can do it or which function I should use?

Thanks in advance!

Well, you would want to use an instantiate function like this:

var prefab : Transform;

function Update () {
    for (var i=0;i<10;i++) {
        Instantiate (prefab, Vector3(i * 2.0, 0, 0), Quaternion.identity);
    }
}

This creates 10 'a' prefabs two units apart from each other. Put this code on an empty gameobject, and see the results!

Another use for `instantiate` is for guns, like this:

var projectile : Rigidbody;

function Update () {
// Ctrl was pressed, launch a projectile
    if (Input.GetButtonDown("Fire1")) {
    // Instantiate the projectile at the position and rotation of this transform
    var clone : Rigidbody;
    clone = Instantiate(projectile, transform.position, transform.rotation);

    // Give the cloned object an initial velocity along the current
    // object's Z axis
    clone.velocity = transform.TransformDirection (Vector3.forward * 10);
    }
}

Put this code on your camera, and you should be set to go. Hope this helps!

http://unity3d.com/support/documentation/Manual/Instantiating%20Prefabs.html

In depth discussion on how to do it.