The difference between JavaScript and the function of PHP and Python

1. JavaScript function Type:

(a), the first kind

function Test (param) {    return 111;}

(ii), the second type of

var function (param) {    return 222;}

Note: Inside the applet is  param:function () {

}
This is actually the same wording!

(iii), the third type of

var k = (param) ==    {return 111;}

Note: The second and third types can be used in callback functions!

2. php function Type:

function Test ($param) {        return 111;}

$callback=function() {  return ' AA 'echo $callback

Note: PHP and JavaScript function basically the same way, but it seems that PHP does not have an arrow function.

3. Python's function notation

(a), the first kind

# Defining Functions def printme (str):    " print any passed-in string "   Print str;    return  #  call function printme (" I want to invoke user-defined function! ");

(ii), the second type of

Lambda x,y:x*yprint R (2,3)

Summary: Each major programming language contains a general definition of the function, and anonymous functions, anonymous functions are generally used in the callback function!

The difference between JavaScript and the function of PHP and Python