var nodePromise = graph.node("http://localhost:75");
nodePromise.then(function(node) {
    // Do something with the node.
});

// Or just
graph.node(0).

var graph = new neo4j.GraphDatabase("http://localhost:7474");

var lisaPromise = graph.node({ "name" : "Lisa" });
var bobPromise = graph.node({ "name" : "Bob" });

var lovePromise = graph.rel(lisaPromise, "LOVES", bobPromise, { "reason" : "All the bling he got." });

// Wait for the promise of a relationship to be fulfilled.
lovePromise.then(function(relationship) {

  // Get the end node of the LOVES relationship
  relationship.getEndNode().then(function(bob) {

    // Once you have a node or relationship object, all properties are immediately available:
    var name = bob.getProperty("name");

    // Change a property like this
    bob.setProperty("name", "Steven");
    bob.save().then(function(steven) {
      // Bob is now saved.
    });

  });

});

git clone http://github.com/neo4j/neo4js.git
cd neo4js
mvn package

mvn site