Basic knowledge of JS function

A function is a type of object, and a function name is a pointer to an object

function as a parameter pass

var box=function(A, b    ) {return  a (b.);} function A (b) {    return b+10;} Alert (Box (A,3));

Arguments.callee calls itself

function box (num) {    if(num<=1) {        return 1;    } Else {        return Num*arguments.callee (num-1);    }} document.write (Box (10));

This represents the scope object where the function is located, and if it is inside the object, it represents the object

Globally, this represents the window

var box={    name:"Tian Wei",    func:function() {        return  This . Name;}    } document.write (Box.func ());//Tian Wei

The prototype object of the function prototype has 2 methods call (), replay ();

function Box (b) {    return a +b;} function sum (c,d) {    return box.apply (this, [c,d]);
Return box.apply (this,arguments);} document.write (sum (3,4));
Posing as box,this means box under window

function Box (b) {    return a +b;} function sum (c,d) {    return box.call (this, c,d);} document.write (sum (3,555));

Call Object impersonating

var color= "Blue"; var box={    color:"Red"}function  showcolor () {     return  This . Color; document.write (Showcolor.call (box));   

Basic knowledge of JS function