Question

Possible Duplicates:
Which equals operator (== vs ===) should be used in JavaScript comparisons?
What is the difference between != and !== operators in JavaScript?

Look at this commit:

Is != the same as !== in JavaScript?

Answer 1

They are subtly not the same.

!= checks the value
!== checks the value and type

'1' != 1   // false (these two are the same)
'1' !== 1 // true (these two are **not** the same).

In the previous example. The first half of the expression is a string, the second half is an integer.