JavaScript Advanced Programming-Phase I

/*
1. Get the logical pixel var pagewidth = Window.innerwidth;var PageHeight = Window.innerheight;console.log ("pagewidth:" + pageWidth);    Console.log ("PageHeight:" + pageheight), if (typeof pagewidth! = "Number") {if (Document.compamode = = = "Css1compat") { }}//2, Get window position var LeftPos = (typeof Window.screenleft = = "Number")? Window.screenleft:window.screenx;var Toppos = (typeof window.screentop = = "Number")? Window.screentop:window.screeny;console.log ("Position left:" + LeftPos); Console.log ("Position top:" + toppos);//2, The two comparison operators do not console.log ("= = =:" + (null = = = undefined)); Trueconsole.log ("= =:" + (null = = undefined)); FALSE3, SetTimeout () apply var date1 = new Date (), Console.log (parseint (Date1.gettime ())), var date2 = new Date (); setTimeout (","), Console.log (parseint (Date2.gettime ())), Console.log (Date1.gettime ()-Date2.gettime ()), 4, Cleartimeout (    Func, Time) Apply function demo () {var date = new Date (); Console.log (date);} var t = setinterval (demo, $); SetTimeout ("Clearinterval (t)", 3000); 5, Timer: All DOM elements are rendered before the timing settimeout ("alert (' Deefe ')", 3000),//5, Closure function createfunction () {var result;            for (var i = 0; i < ten; i++) {Result[i] = function () {result[i].index = i;        return i;    }} console.log (Result[0].index); return result;}    function createfunction () {var result = new Array (); for (var i = 0; i < i++) {Result[i] = function (num) {return function () {result[                I].index = i;                Console.log (i);            return num;        };    } (i); } return result; Console.log (Createfunction ());//6, trinocular operator Console.log ((x > y x:y) > z? (x > Y x:y): z);//7, Max Math.max () cannot pass in the array, only pass in the parameter column Console.log (max (1)); function Max () {var arr = [12112    , 21, 212, 12, 3213]; return Math.max (arr);}    8, callback function, return the previous operation, each time the result is saved in memory, Occupy memory function Factorial1 (num) {if (num > 0) {return num * FACTORIAL1 (NUM-1);    } else {return 1;}}//9, callback function, the result returns, does not occupy the extra memory function Factorial2 (num, total) {if (num > 0) {return total = num * FACTORIAL2 (num    -1);    } else {return 1; }}var n = 10;console.log ("Factorial1 (" + N + "):" + FACTORIAL1 (n)); Console.log ("Factorial2 (" + N + "):" + Factorial2 (n));    /10, function Interrupt mode functions say () {Console.log ("1");//1 return 0; Console.log ("2"); The function has ended without executing} interrupt loop mode 1.BREAK2.CONTINUE//11, Ecmscript full parser alert (eval ("1+2")),//12, Leap year judgment var j = 1;for (var i = 1; I <= 3 000;        i++) {if (GetYear (i)) {Console.log (j + ":" + i);    j + +; }}function GetYear (year) {if (year% 400 = = 0 | | (year% 4 = = = 0 && Year% 100! = 0))    {return 1;    } else {return 0; }}//13, Push (), pop (), Shift (), unshift () difference var arr = [1, 2, 3];arr.push (4); Console.log ("Push (4):" + arr); 1,2,3,4 add var from the tail arr = [1, 2, 3];arr.pop (4); Console.log (arr); From the tail out of the stack var arr = [1, 2, 3];arr.unshift (4) Console.log (arr); 4,1,2,3 add Var from the head arr = [1, 2, 3];arr.shift (4);Console.log (arr); 2,3 from the tail add//14, + + in front and in the back of the difference var n = 100;alert (++n); 101var m = 100;alert (m++); 100//15, conditional operator Console.log (> 4?) "Yes": "No");


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JavaScript Advanced Programming-Phase I