smooth scroll by x pixels using arrow keys up and down

Question

I am trying to make the whole html page smooth scrolling by hitting arrow keys up and down by exact amount of pixels. (EXAMPLE: I hit arrow down and the page scrolls down by 300px then I hit that arrow again and it scrolls again by 300px, then I hit up arrow key and it scrolls up by 300px...) I founded these posts: similiar post similiar post 2 but I dont know how to make the arrow keys working with it. Can you please help me?

Answer 1

我不知道它是否对您有帮助。但是建议通过这个（jscrollpane.kelvinluck.com） 网站进行滚动浏览，我已经通过此方法修改了网页，使其具有简单的滚动屏。