If statement not works [duplicate]

i have code that adds flags to currentUser in discord, and i have created simple menu with prompt("") and alert(""). Code:

            var cs = prompt("Вы хотите настройть скрипт?\n" +
                                        "true - Да\n" +
                                        "false - Нет");

            if (cs = "true") {
                var settings = prompt("Настройки:\n" + 
                                                     "Настройть пользователя - 1\n" + 
                                                     "Настройть нитро - 2\n" + 
                                                     "Настройть значки - 3\n" + 
                                                     "Автор - 4\n" + 
                                                     "Выход - 5\n\n" + 
                                                     "Приятного использования!");
            } else {}

I need to do nothing when cs = false, but else {} not works for me. Check code yourself.