如何在mxGraph javascript中获取顶点

var graph = new mxGraph(container);

var model = graph.getModel();

var vertices = model.getChildVertices(model.getRoot());
for (var i = 0; i < vertices.length; i++) {
    var vertex = vertices[i];
    // 处理顶点
}

var vertexId = model.getId(vertex);
var vertexGeometry = model.getGeometry(vertex);
var vertexX = vertexGeometry.x;
var vertexY = vertexGeometry.y;
var vertexWidth = vertexGeometry.width;
var vertexHeight = vertexGeometry.height;

var vertexLabel = graph.getLabel(vertex);
var vertexStyle = graph.getCellStyle(vertex);