There are three values may represent false "" in the js, null, undefined
So in the end the difference between what they do
First we look at these three types of worth
"" Represents a string of characters no
initializing a null or empty object node represents an element of a node element does not exist
null and undefined values are equal, but different types of
It indicates that only double equal sign ratio, the ratio of three equal number surpasses both types, can be seen from the above FIG their type is not equal to an undefined one object
