How can I calculate the distance between two 3D positions?

3D two point distance calculation try to best from side 

function dist(x0,y0,z0,x1,y1,z1){

deltaX = x1 - x0;
deltaY = y1 - y0;
deltaZ = z1 - z0;

distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ);

return distance;
}