javascript - Why my variable "c" has changed? -

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var c = new date(2015, 11, 25); var d = c; d.setfullyear(2000); console.log(c); console.log(d);

//why variable "c" has changed in code?

line 1: create date object , assign reference c.

line 2: copy value of c (a reference date object) d

line 3: modify date object. still referenced 2 variables.

if want create new date object , assign d need explicitly.

var c = new date(2015, 11, 25);  var d = new date(c);  d.setfullyear(2000);  console.log(c);  console.log(d);


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