Условные операторы в JavaScript необходимы для принятия решений в коде. Они позволяют выполнять различные действия в зависимости от различных условий.
Оператор if
- это самый основной условный оператор, используемый для выполнения блока кода только в случае, если указанное условие истинно.
Синтаксис:
Пример:
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Оператор else
дополняет оператор if
, позволяя выполнять код, когда условие if
ложно.
Синтаксис:
if (condition) {
} else {
}
Пример:
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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else if
позволяет проверять несколько условий последовательно.
Синтаксис:
if (condition1) {
} else if (condition2) {
} else {
}
Пример:
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Тернарный оператор является сокращением для оператора if...else
, полезным для присвоения значений на основе условия.
Синтаксис:
let result = (condition) ? value1 : value2;
Пример:
let message = (temperature > 30) ? "It's a hot day" : "It's not a hot day";
Владение условными операторами в JavaScript крайне важно для создания динамического и отзывчивого кода. Эти операторы позволяют скрипту принимать решения и реагировать по-разному в различных условиях.