奇怪的js NaN and Infinity

Parsing something that isn't a number results in NaN. isNaN helps to detect those cases:

1. parseInt("hello",10)//NaN
2. isNaN(parseInt("hello",10))//true

Division through zero results in Infinity:

1. 1/0//Infinity

Both NaN and Infinity are of type "number":

1. typeofNaN//"number"
2. typeofInfinity//"number"

Note that NaN compares in a strange way:

1. NaN==NaN//false(!)

But:

1. Infinity==Infinity//true