선택 박스 옵션 추가하기(select box & option)

// Create a new option element.
var option = document.createElement("option");

// Set the text and value properties of the option element.
option.text = "Option Text";
option.value = "Option Value";

// Append the option element to the select element.
var select = document.getElementById("mySelect");
select.appendChild(option);