JavaScript Intensive Tutorial--object value passing and reference passing

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Function setname (obj) { obj.name= "Tom";//Before execution, the Name property of obj and person at this time is undefined obj1=new  Object ();  obj1=obj;//declares a global object, then obj, obj1, and person should be the same object at this time  }//setname function is executed, the Obj object is destroyed and the remaining objects are still present   Person=new object ();//declares the person object  setname (person);//invokes the SetName function and passes the object as a parameter  obj1.name= "Lucy";// Change the Name property of person by Obj1  alert (person.name);//Output "Lucy", the left side of the code conclusion gives the impression that the JavaScript object is passed by reference/* I want to know when calling SetName ( person), whether the person passes to the function setname (obj) position is either a value pass or a reference pass, and if you follow the instructions--excerpt to the JavaScript Advanced Tutorial (third edition) function  setname (obj) {obj.name= "Tom"; Obj=new object (); Obj.name= "Lucy";} Person=new object ();//Declare Person object SetName (person);//alert (person.name);//Output Tom, I feel that the person and obj should be using a reference when calling the function. But to re-declare the obj local object in the function, I think after executing the obj=new object () re-declaring the object, obj and the person object calling SetName (person) are different references (addresses) ,  obj.name= "Lucy", this sentence to person at this time does not work at all, so there will be the conclusion of the book, the output as "Tom" results, so I think the book is still not enough to prove that the object in JavaScript is the value of the transfer of this conclusion , I would like to ask how to understand this problem, thank you, * * again attached to the Internet to find a piece of code, in the call function input is the object, why have different results: &LT;SCRIpt type= "Text/javascript" >function foo (v3) {V3={a:3};alert (v3.a);//3}var v4={};foo (v4); alert (v4.a);//undefined</script><script type= "Text/javascript" >function fooled (v2) {v2.b=4; alert (v2.b);//4}var v1=new object (); fooled (v1); alert (v1.b);//4</script>

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JavaScript Intensive Tutorial--object value passing and reference passing