如何实现Javascript颜色选择器

Question

I'm contemplating the development of a component for picking color off of a web page. This is NOT a color selection component which allows you to choose a specific color off of a color wheel or pallete. I'm referring to a component which will provide me with a crosshair to click o nthe specific spot on the page and "pick" the color under it. I know, on the web, this is very complex. I couldn't find an existing component nor think of a good way to implement this other than complex markup inspection and image inspection.

Any pointers?

Answer 1

Firefox有一个名为“ ColorZilla”的加载项，请检查出来。