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ÐÐ¿Ð¸ÑÐ°Ð½Ð¸Ðµ

Ð§Ð¸ÑÐ»Ð°
Ð¡ÑÑÐ¾ÐºÐ¸
ÐÐ¾Ð³Ð¸ÑÐµÑÐºÐ¸Ðµ ÑÐ¸Ð¿Ñ
Ð¤ÑÐ½ÐºÑÐ¸Ð¸
ÐÐ±ÑÐµÐºÑÑ
Ð¡Ð¸Ð¼Ð²Ð¾Ð»Ñ (Ð½Ð¾Ð²ÑÐ¹ ÑÐ¸Ð¿ Ð¸Ð· ÑÐµÑÑÐ¾Ð¹ ÑÐµÐ´Ð°ÐºÑÐ¸Ð¸)

Ð§Ð¸ÑÐ»Ð°
Ð¡ÑÑÐ¾ÐºÐ¸
ÐÐ¾Ð³Ð¸ÑÐµÑÐºÐ¸Ðµ ÑÐ¸Ð¿Ñ
Ð¡Ð¸Ð¼Ð²Ð¾Ð»Ñ (Ð½Ð¾Ð²ÑÐ¹ ÑÐ¸Ð¿ Ð¸Ð· ÑÐµÑÑÐ¾Ð¹ ÑÐµÐ´Ð°ÐºÑÐ¸Ð¸)
ÐÐ±ÑÐµÐºÑÑ
Null
undefined

Ð§Ð¸ÑÐ»Ð°

0.1 + 0.2 == 0.30000000000000004;

Math.sin(3.5);
var circumference = Math.PI * (r + r);

parseInt("123", 10); // 123
parseInt("010", 10); // 10

parseInt("010"); // 8
parseInt("0x10"); // 16

+"42"; // 42
+"0x10"; // 16

parseInt("hello", 10); // NaN

1 / 0; // Infinity
-1 / 0; // -Infinity

isFinite(1 / 0); // false
isFinite(-Infinity); // false
isFinite(NaN); // false

Ð¡ÑÑÐ¾ÐºÐ¸

"hello".charAt(0); // h
"hello, world".replace("hello", "goodbye"); // goodbye, world
"hello".toUpperCase(); // HELLO

ÐÑÑÐ³Ð¸Ðµ ÑÐ¸Ð¿Ñ

false, 0, Ð¿ÑÑÑÐ°Ñ ÑÑÑÐ¾ÐºÐ° (""), NaN, null Ð¸ undefined Ð¿ÑÐµÐ¾Ð±ÑÐ°Ð·ÑÑÑÑÑ Ð² false.
ÐÑÐµ Ð¾ÑÑÐ°Ð»ÑÐ½ÑÐµ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ Ð¿ÑÐµÐ¾Ð±ÑÐ°Ð·ÑÑÑÑÑ Ð² true.

Boolean(""); // false
Boolean(234); // true

ÐÐµÑÐµÐ¼ÐµÐ½Ð½ÑÐµ

let a;
let name = "Simon";

// myLetVariable Ð½ÐµÐ´Ð¾ÑÑÑÐ¿Ð½Ð° Ð·Ð´ÐµÑÑ

for (let myLetVariable = 0; myLetVariable < 5; myLetVariable++) {
  // myLetVariable Ð´Ð¾ÑÑÑÐ¿Ð½Ð° ÑÐ¾Ð»ÑÐºÐ¾ Ð·Ð´ÐµÑÑ
}

// myLetVariable Ð½ÐµÐ´Ð¾ÑÑÑÐ¿Ð½Ð° Ð·Ð´ÐµÑÑ

const Pi = 3.14; // Ð² Ð¿ÐµÑÐµÐ¼ÐµÐ½Ð½ÑÑ Pi Ð·Ð°Ð¿Ð¸ÑÐ°Ð½Ð¾ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ðµ.
Pi = 1; // Ð²ÑÐ·Ð¾Ð²ÐµÑ Ð¸ÑÐºÐ»ÑÑÐµÐ½Ð¸Ðµ, ÑÐ°Ðº ÐºÐ°Ðº Ð·Ð½Ð°ÑÐµÐ½Ð¸Ðµ ÐºÐ¾Ð½ÑÑÐ°Ð½ÑÑ Ð½ÐµÐ»ÑÐ·Ñ Ð¸Ð·Ð¼ÐµÐ½Ð¸ÑÑ.

var a;
var name = "Simon";

// myVarVariable Ð´Ð¾ÑÑÑÐ¿Ð½Ð° Ð·Ð´ÐµÑÑ

for (var myVarVariable = 0; myVarVariable < 5; myVarVariable++) {
  // myVarVariable Ð´Ð¾ÑÑÑÐ¿Ð½Ð° Ð´Ð»Ñ Ð²ÑÐµÐ¹ ÑÑÐ½ÐºÑÐ¸Ð¸
}

// myVarVariable Ð´Ð¾ÑÑÑÐ¿Ð½Ð° Ð¸ Ð·Ð´ÐµÑÑ

ÐÐ¿ÐµÑÐ°ÑÐ¾ÑÑ

"hello" + " world"; // "hello world"

"3" + 4 + 5; // "345"
3 + 4 + "5"; // "75"

123 == "123"; // true
1 == true; // true

1 === true; // false
123 === "123"; // false
true === true; // true

Ð£Ð¿ÑÐ°Ð²Ð»ÑÑÑÐ¸Ðµ ÑÑÑÑÐºÑÑÑÑ

var name = "kittens";
if (name == "puppies") {
  name += "!";
} else if (name == "kittens") {
  name += "!!";
} else {
  name = "!" + name;
}
name == "kittens!!";

while (true) {
  // Ð±ÐµÑÐºÐ¾Ð½ÐµÑÐ½ÑÐ¹ ÑÐ¸ÐºÐ»!
}

var input;
do {
  input = get_input();
} while (inputIsNotValid(input));

for (var i = 0; i < 5; i++) {
  // ÐÑÐ¿Ð¾Ð»Ð½Ð¸ÑÑÑ 5 ÑÐ°Ð·
}

for (let value of array) {
  // Ð¾Ð¿ÐµÑÐ°ÑÐ¸Ð¸ Ñ value
}

Ð¸ for...in:

for (let property in object) {
  // Ð¾Ð¿ÐµÑÐ°ÑÐ¸Ð¸ Ð½Ð°Ð´ ÑÐ²Ð¾Ð¹ÑÑÐ²Ð°Ð¼Ð¸ Ð¾Ð±ÑÐµÐºÑÐ°
}

var name = o && o.getName();

var name = otherName || "default";

var allowed = age > 18 ? "yes" : "no";

switch (action) {
  case "draw":
    drawit();
    break;
  case "eat":
    eatit();
    break;
  default:
    donothing();
}

switch (a) {
  case 1: // fallthrough
  case 2:
    eatit();
    break;
  default:
    donothing();
}

switch (1 + 3) {
  case 2 + 2:
    yay();
    break;
  default:
    neverhappens();
}

ÐÐ±ÑÐµÐºÑÑ

Ð¡Ð»Ð¾Ð²Ð°ÑÐ¸ Ð² Python.
Ð¥ÐµÑÐ¸ Ð² Perl Ð¸ Ruby.
Ð¢Ð°Ð±Ð»Ð¸ÑÑ ÑÐµÑÐµÐ¹ Ð² C Ð¸ C++.
HashMaps Ð² Java.
ÐÑÑÐ¾ÑÐ¸Ð°ÑÐ¸Ð²Ð½ÑÐµ Ð¼Ð°ÑÑÐ¸Ð²Ñ Ð² PHP.

Ð ÑÐ°ÐºÐ¶Ðµ:

var obj = {
  name: "Carrot",
  for: "Max",
  details: {
    color: "orange",
    size: 12,
  },
};

obj.details.color; // orange
obj["details"]["size"]; // 12

// ÐÑÐ·Ð¾Ð²ÐµÑ Syntax error, Ð²ÐµÐ´Ñ 'for' ÑÑÐ¾ Ð·Ð°ÑÐµÐ·ÐµÑÐ²Ð¸ÑÐ¾Ð²Ð°Ð½Ð½Ð¾Ðµ ÑÐ»Ð¾Ð²Ð¾
obj.for = "Simon";

// Ð ÑÑÑ Ð²ÑÑ Ð½Ð¾ÑÐ¼Ð°Ð»ÑÐ½Ð¾
obj["for"] = "Simon";

ÐÐ°ÑÑÐ¸Ð²Ñ

var a = new Array();
a[0] = "dog";
a[1] = "cat";
a[2] = "hen";
a.length; // 3

var a = ["dog", "cat", "hen"];
a.length; // 3

var a = ["dog", "cat", "hen"];
a[100] = "fox";
a.length; // 101

typeof a[90]; // undefined

for (var i = 0; i < a.length; i++) {
  // Ð¡Ð´ÐµÐ»Ð°ÑÑ ÑÑÐ¾-Ð½Ð¸Ð±ÑÐ´Ñ Ñ ÑÐ»ÐµÐ¼ÐµÐ½ÑÐ¾Ð¼ a[i]
}

for (const currentValue of a) {
  // Ð¡Ð´ÐµÐ»Ð°ÑÑ ÑÑÐ¾-Ð½Ð¸Ð±ÑÐ´Ñ Ñ currentValue
}

["dog", "cat", "hen"].forEach(function (currentValue, index, array) {
  // Ð¡Ð´ÐµÐ»Ð°ÑÑ ÑÑÐ¾-Ð½Ð¸Ð±ÑÐ´Ñ Ñ currentValue Ð¸Ð»Ð¸ array[index]
});

function add(x, y) {
  var total = x + y;
  return total;
}

add(); // NaN
// ÐÐµÐ»ÑÐ·Ñ Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸ÑÑ ÑÐ»Ð¾Ð¶ÐµÐ½Ð¸Ðµ undefined Ð¸ undefined

add(2, 3, 4); // 5
// Ð¸ÑÐ¿Ð¾Ð»ÑÐ·ÑÑÑÑÑ ÑÐ¾Ð»ÑÐºÐ¾ Ð¿ÐµÑÐ²ÑÐµ Ð´Ð²Ð° Ð°ÑÐ³ÑÐ¼ÐµÐ½ÑÐ°, "4" Ð¸Ð³Ð½Ð¾ÑÐ¸ÑÑÐµÑÑÑ

function add() {
  var sum = 0;
  for (var i = 0, j = arguments.length; i < j; i++) {
    sum += arguments[i];
  }
  return sum;
}

add(2, 3, 4, 5); // 14

function avg() {
  var sum = 0;
  for (var i = 0, j = arguments.length; i < j; i++) {
    sum += arguments[i];
  }
  return sum / arguments.length;
}
avg(2, 3, 4, 5); // 3.5

function avg(...args) {
  var sum = 0;
  for (let value of args) {
    sum += value;
  }
  return sum / args.length;
}

avg(2, 3, 4, 5); // 3.5

var avg = function () {
  var sum = 0;
  for (var i = 0, j = arguments.length; i < j; i++) {
    sum += arguments[i];
  }
  return sum / arguments.length;
};

var a = 1;
var b = 2;
(function () {
  var b = 3;
  a += b;
})();
a; // 4
b; // 2

function countChars(elm) {
  if (elm.nodeType == 3) {
    // TEXT_NODE
    return elm.nodeValue.length;
  }
  var count = 0;
  for (var i = 0, child; (child = elm.childNodes[i]); i++) {
    count += countChars(child);
  }
  return count;
}

var charsInBody = (function counter(elm) {
  if (elm.nodeType == 3) {
    // TEXT_NODE
    return elm.nodeValue.length;
  }
  var count = 0;
  for (var i = 0, child; (child = elm.childNodes[i]); i++) {
    count += counter(child);
  }
  return count;
})(document.body);

Ð¡Ð¾Ð±ÑÑÐ²ÐµÐ½Ð½ÑÐµ Ð¾Ð±ÑÐµÐºÑÑ

function makePerson(first, last) {
  return {
    first: first,
    last: last,
  };
}

function personFullName(person) {
  return person.first + " " + person.last;
}

function personFullNameReversed(person) {
  return person.last + ", " + person.first;
}

s = makePerson("Simon", "Willison");
personFullName(s); // Simon Willison
personFullNameReversed(s); // Willison, Simon

function makePerson(first, last) {
  return {
    first: first,
    last: last,
    fullName: function () {
      return this.first + " " + this.last;
    },
    fullNameReversed: function () {
      return this.last + ", " + this.first;
    },
  };
}
s = makePerson("Simon", "Willison");
s.fullName(); // Simon Willison
s.fullNameReversed(); // Willison, Simon

s = makePerson("Simon", "Willison");
var fullName = s.fullName;
fullName(); // undefined undefined

function Person(first, last) {
  this.first = first;
  this.last = last;
  this.fullName = function () {
    return this.first + " " + this.last;
  };
  this.fullNameReversed = function () {
    return this.last + ", " + this.first;
  };
}
var s = new Person("Simon", "Willison");

function personFullName() {
  return this.first + " " + this.last;
}
function personFullNameReversed() {
  return this.last + ", " + this.first;
}
function Person(first, last) {
  this.first = first;
  this.last = last;
  this.fullName = personFullName;
  this.fullNameReversed = personFullNameReversed;
}

function Person(first, last) {
  this.first = first;
  this.last = last;
}
Person.prototype.fullName = function fullName() {
  return this.first + " " + this.last;
};
Person.prototype.fullNameReversed = function fullNameReversed() {
  return this.last + ", " + this.first;
};

s = new Person("Simon", "Willison");
s.firstNameCaps();
// TypeError on line 1: s.firstNameCaps is not a function

Person.prototype.firstNameCaps = function () {
  return this.first.toUpperCase();
};
s.firstNameCaps(); // "SIMON"

var s = "Simon";
s.reversed(); // TypeError on line 1: s.reversed is not a function

String.prototype.reversed = function reversed() {
  var r = "";
  for (var i = this.length - 1; i >= 0; i--) {
    r += this[i];
  }
  return r;
};
s.reversed(); // "nomiS"

"This can now be reversed".reversed();
// desrever eb won nac sihT

var s = new Person("Simon", "Willison");
s.toString(); // [object Object]

Person.prototype.toString = function () {
  return "<Person: " + this.fullName() + ">";
};

s.toString(); // "<Person: Simon Willison>"

function trivialNew(constructor, ...args) {
  var o = {}; // Ð¡Ð¾Ð·Ð´Ð°ÑÐ¼ Ð½Ð¾Ð²ÑÐ¹ Ð¾Ð±ÑÐµÐºÑ
  constructor.apply(o, args);
  return o;
}

ÐÑÐ·Ð¾Ð²

var bill = trivialNew(Person, "William", "Orange");

var bill = new Person("William", "Orange");

function lastNameCaps() {
  return this.last.toUpperCase();
}
var s = new Person("Simon", "Willison");
lastNameCaps.call(s);
// ÐÐ½Ð°Ð»Ð¾Ð³Ð¸ÑÐ½Ð¾ Ð·Ð°Ð¿Ð¸ÑÐ¸:
s.lastNameCaps = lastNameCaps;
s.lastNameCaps(); // WILLISON

ÐÐ»Ð¾Ð¶ÐµÐ½Ð½ÑÐµ ÑÑÐ½ÐºÑÐ¸Ð¸

function parentFunc() {
  var a = 1;

  function nestedFunc() {
    var b = 4; // parentFunc can't use this
    return a + b;
  }
  return nestedFunc(); // 5
}

ÐÐ°Ð¼ÑÐºÐ°Ð½Ð¸Ñ (Closures)

function makeAdder(a) {
  return function (b) {
    return a + b;
  };
}

var x = makeAdder(5);
var y = makeAdder(20);
x(6); // ?
y(7); // ?

x(6); // Ð²Ð¾Ð·Ð²ÑÐ°ÑÐ¸Ñ 11
y(7); // Ð²Ð¾Ð·Ð²ÑÐ°ÑÐ¸Ñ 27

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Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://developer.mozilla.org/ru/docs/Web/JavaScript/Guide/Language_overview below:

ÐÐ¾Ð²ÑÐ¾ÑÐ½Ð¾Ðµ Ð²Ð²ÐµÐ´ÐµÐ½Ð¸Ðµ Ð² JavaScript (JS ÑÑÐµÐ±Ð½Ð¸Ðº) - JavaScript

ÐÐ¾Ð²ÑÐ¾ÑÐ½Ð¾Ðµ Ð²Ð²ÐµÐ´ÐµÐ½Ð¸Ðµ Ð² JavaScript (JS ÑÑÐµÐ±Ð½Ð¸Ðº) - JavaScript