Sample introduction to the difference between js creation objects

A: var obj1 = obj2 = new Object();

with

B: var obj1 = new Object(),
Obj2 = new Object ();

There are two different ways to assign values, resulting in different results

A will point two objects to the same memory address, resulting in the contents of the two objects being the same

var t1 = t2 = new Object();
t1.name = 'hello';
t2.name = 'kao';
t1.name = null;
alert(t2.name); //  The results for  null

B doesn't