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substring

String.substring - JavaScript | MDN
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/String/substring

substr

String.substr - JavaScript | MDN
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/String/substr

トリム(trim)

Javascript で trim するには - Enjoi Blog
http://blog.enjoitech.jp/article/180

trim()関数はIEは９から対応。
String.trim - JavaScript | MDN
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/String/trim