드롭다운 메뉴 만들기:
https://www.w3schools.com/howto/howto_js_dropdown.asp
How To Create a Dropdown Menu With CSS and JavaScript
How TO - Clickable Dropdown Learn how to create a clickable dropdown menu with CSS and JavaScript. Dropdown A dropdown menu is a toggleable menu that allows the user to choose one value from a predefined list: Try it Yourself » Create a Clickable Dropdown
www.w3schools.com
var 사용방법:
https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/
Var, Let, and Const – What's the Difference?
A lot of shiny new features came out with ES2015 (ES6). And now, since it's 2020, it's assumed that a lot of JavaScript developers have become familiar with and have started using these features. While this assumption might be partially true, it's still po
www.freecodecamp.org
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