the output of the object is not the expected result
in daily programming
var obj = {"a" : 1};
var obj1 = {"b" : obj};
console.log(obj1);
console.log(obj);
obj.a = 3;
expected result: {b: {aburel}}. The actual output is shown in figure 
if you output like this, the result will be as expected:
var obj = {"a" : 1};
var obj1 = {"b" : obj};
console.log(JSON.stringify(obj1));
console.log(JSON.stringify(obj));
obj.a = 3; this is because methods such as console.log/dir/. display the latest state of the object in memory when it is output, so the value of a in your output has been modified to the latest value (that is, affected by obj.a = 3 ).
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