javascript - How can I get a specific parameter from location.search?

This question is old and things have evolved in JavaScript.
You can now do this:

const params = {}
document.location.search.substr(1).split('&').forEach(pair => {
  [key, value] = pair.split('=')
  params[key] = value
})

and you get params.year that contains 2008.
You would also get other query params in your params object.

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Edit: a shorter/cleaner way to do this:

const params = new Map(location.search.slice(1).split('&').map(kv => kv.split('=')))

You can then test if the year param exists with:

params.has('year')  // true

Or retrieve it with:

params.get('year')  // 2008