如何在Cytoscape.js中制作加权图？

var cy = cytoscape();

cy.add([
  { data: { id: 'node1', weight: 3 }, position: { x: 100, y: 100 } },
  { data: { id: 'node2', weight: 5 }, position: { x: 200, y: 200 } },
  { data: { id: 'edge1', source: 'node1', target: 'node2', weight: 2 } }
]);

cy.style()
  .selector('node')
  .style({
    'background-color': '#ff0000',
    'label': 'data(id)',
    'width': 'data(weight)',
    'height': 'data(weight)'
  })
  .selector('edge')
  .style({
    'width': 'data(weight)',
    'line-color': '#0000ff',
    'target-arrow-color': '#0000ff',
    'target-arrow-shape': 'triangle'
  })
  .update();

cy.layout({ name: 'random' }).run();

cy.mount(document.getElementById('cy'));