Get Sharepoint List Base Template ID using javascript.

var siteUrl = '/ClientGNH/New%20ProjectTemplate';
var title = ""; // List name
function retrieveSpecificListProperties() {

    var clientContext = new SP.ClientContext(siteUrl);
    var oWebsite = clientContext.get_web();
    this.collList = oWebsite.get_lists().getByTitle(title);
    clientContext.load(collList);
    clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));

}
function onQuerySucceeded() {

    var listInfo = ''+collList.get_title() +'\n'+ collList.get_baseTemplate();  
    alert(listInfo);
}

function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

retrieveSpecificListProperties();