How can I access Google Sheet spreadsheets only with Javascript?

I want to access Google Spreadsheets using JavaScript only (no .NET, C#, Java, etc.)

I came here and was shocked to know that there is NO API for JavaScript to access Google Sheets.

Please tell me how to access (CREATE/EDIT/DELETE) Google Sheets using JavaScript or any of its frameworks like jQuery.

Answer

I have created a simple javascript library that retrieves google spreadsheet data (if they are published) via the JSON api:

https://github.com/mikeymckay/google-spreadsheet-javascript

You can see it in action here:

http://mikeymckay.github.com/google-spreadsheet-javascript/sample.html