Javascript web page black and white effect implementation code (compatible with IE/FF, etc.)_javascript skills

The following demo address is partial gray

Partial gray demo address: http://demo.jb51.net/js/grayscale/index.html
Fully gray demo address: http://demo.jb51.net/js/grayscale/demo2.htm
Usage:

1. First introduce grayscale.js into the web page document.
2. Execute the grayscale function.

Sample code:

Copy code The code is as follows:

grayscale(document .body); //The entire site turns gray
grayscale(document.getElementById("main"));//The specified element turns gray
grayscale.reset(document.getElementById("main"));/ /Specify element restoration

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