unusedjs

查看js的有效使用情况:

https://github.com/gmetais/unusedjs

Installation

You need to open your console and write:

npm install unusedjs -g

Use

1. Start the server by writing in your console: unused-js-proxy

2. Configure your browser's proxy to localhost:3838. Only set the HTTP proxy, let the HTTPS (=SSL) proxy empty.

3. Clear your browser cache <== IMPORTANT

4. Open your browser's and wait until the page is fully loaded

5. Open your browser's console and write _unusedjs.report()

Results

Results are displayed in the console:

Why "(for the moment)"? Because the score might change if some more JS gets executed in the page.

Inspect what code is unused for one file (experimental)

_unusedjs.file(<file number>)

There are stille some bugs with very large files, especially when minified on one very long line. Best displayed on Chrome or Safari.