inheritance - How to pass javascript object value to its "child" object -


I am trying to pass a variable for a child object of my original object, but its return is undefined. (Obviously I'm not sure how a JS object works) 

  var = {pid: '565', child: {cid: this.pid + '_child_789', say hello: function () {warning ('my id is' + this.cid ); }}}   
 Calling  parent.child.sayHello ()  log  this.cid  as undefined.  
 I am wrong (wrong) thinking that the child will be the heir to the property of the property and it can be specified by  this.pid , but can not do it.  
 Is there any way to do this with a hard-coding quality?  
 I know that I can do this after creating the  parent.child.cid = parent.pid + '_child_789'  object, but it is not scalable or practical for me.  
 
 
 You can not use that kind of property in your object; I will go into more detail, However, this question has already been answered several times in advance. Please review the following questions:

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