var a = [1,2,3]; var b = a; a = [4,5,6]; alert(b); //[1,2,3]
===========================================
var a = [1,2,3]; var b = a; a.pop(); alert(b); //[1,2]

var a = [1,2,3]; var b = a; a = [4,5,6]; alert(b); //[1,2,3]
===========================================
var a = [1,2,3]; var b = a; a.pop(); alert(b); //[1,2]

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