Wordpress like simple sanitize_title for javascript. Not checking for accents, since it is a slow process.

slug.js

if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
  };
}

function slug(s) {
	s = s.toLowerCase().trim();
	s = s.replace(/[^a-z0-9\s_-]/ig, '');
	return s.replace(/[\s\uFEFF\xA0]+/ig, '-');
}