Comparison between undefined and null in javascript and examples of function types

Comparison between undefined and null in javascript and examples of function types

/**
* Undefined = null returns true.
* Undefined === null returns false
* Undefined indicates that the variable is defined but not assigned a value.
* Null indicates the reference of an empty object.
*/

// Function Type
Ext. onReady (function (){
Function fun (){
Console.info ("info ...");
}

// Fun (); indicates calling the function fun
// Fun indicates referencing the name of the above function
Alert (typeof fun); // This is to reference the above fun function name to determine the type of fun function, which is the same as the object reference
});