为什么这两个日期在javascript中不相等？

Question

I'm comparing two dates in objA and objB, and they are not equal as the following console output shows.
Can't understand why..

objA[keysA[i]]
Sun Sep 25 2016 00:00:00 GMT+0900 (KST)
objB[keysA[i]]
Sun Sep 25 2016 00:00:00 GMT+0900 (KST)
typeof objA[keysA[i]]
"object"
typeof objB[keysA[i]]
"object"
objA[keysA[i]] !== objB[keysA[i]]
true

Answer 1

You'll need to stringify the dates & compare them that way. For example:

var date1 = new Date(); 
var date2 = new Date();

console.log (date1==date2); // This will print false

But if we stringify the dates and compare them that way this will become true, like so:

console.log (date1.toString() === date2.toString())

Answer 2

In JavaScript you compare objects by reference.

let a = {};
let b = {};
let c = a;

a == b //false
a == c //true

A simple way of comparing objects is to convert them to a string and compare the string. You can use Date.prototype.toString to compare Date objects like this

objA[keysA[i]].toString() !== objB[keysA[i]]].toString() //false