clientContext = new SP.ClientContext.get_current();
if (clientContext != undefined && clientContext != null) {
var web = clientContext.get_web();
var listCollection = web.get_lists();
var list = listCollection.getByTitle("Wiki");
var viewcollection = list.get_views();
clientContext.load(viewcollection);
clientContext.executeQueryAsync(Function.createDelegate(this, GetViews), Function.createDelegate(this, this.onQueryFailed));