Turn on Specific Axis Constraints - Keeping Others Selected (JS)

I have a button that turns axis constraints positions X and Z on and off. Here's the script (JavaScript):

 var toggle = false;
 
 function Toggle () {
     toggle = !toggle;
     if (toggle) {
         GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.FreezePositionX | RigidbodyConstraints.FreezePositionZ;
     }else{
         GetComponent.<Rigidbody>().constraints &= ~RigidbodyConstraints.FreezePositionX;
         GetComponent.<Rigidbody>().constraints &= ~RigidbodyConstraints.FreezePositionZ;
     }
 }

If I turn it on, and other constraints are selected, it turns them off and keeps X and Z on. If I turn it off, and other constraints are selected, only X and Z turn off - like it's supposed to.

if statement isn't working the way I want it to. else statement is working correctly.

I don't understand what I need to do to turn on X and Z while other constraints are on WITHOUT turning them off.

(I've looked all over the internet for this, and I can't find a proper solution. I did find this, which helped me with the else statement, but I don't understand the logic enough to apply it to the if statement: " http://answers.unity3d.com/questions/238887/can-you-unfreeze-a-rigidbodyconstraint-position-as.html ").

I'd really appreciate someone to point out my mistake and help me understand this logic. Thank you so much in advance!