Test for value in Javascript Array

In SQL Server, I could say:

WHERE X
            IN(1,2)

How would you
rewrite the following in
JavaScript:

if (X==1 || X==2)
            {}

itemprop="text">

class="normal">Answer

Use href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf"
rel="noreferrer">indexOf to see if
x is in an
array.

if([1,2].indexOf(x) !==
            -1)