Get List items by CAML query

CAMLGetListItems.js

function CAMLGetListItems(SPHostUrl,listTitle,query){
    var SPContext = new SP.ClientContext.get_current(SPHostUrl);
    var web = SPContext.get_web();
    var List = web.get_lists().getByTitle(listTitle);
    var listItems;
    var query = new SP.CamlQuery(query);
    query.set_viewXml(query);

    listItems = List.getItems(query);
    SPContext.load(listItems);

    SPContext.executeQueryAsync(GetListItems_Successor, GetListItems_Fail);
}
function GetListItems_Successor(sender, args){
    var listItemEnumerator = listItems.getEnumerator();
    while (listItemEnumerator.moveNext()){
	var oListItem = listItemEnumerator.get_current();
        var title = oListItem.get_item('Title');
    	console.log(title);
    }
}

function GetListItems_Fail(err){
    console.log('error')
}

var CAMLQuery = '<View><Query><Where><Geq><FieldRef Name=\'ID\'/>' + 
        '<Value Type=\'Number\'>0</Value></Geq></Where></Query><RowLimit>30</RowLimit></View';
CAMLGetListItems('https://domain.sharepoint.com/teams/mySite/','xyzList',CAMLQuery);