3.md

index.js

properties: {
  id: {
    size: 70,
    sortable: true
  },
  name: {
    size: 100,
    sortable: true
  },
  /* 以下を追加 */
  position: {
    size: 110
  },
  zipcode: {
    size: 80
  },
  address: {
    size: 110
  },
  tel: {
    size: 110
  },
  company: {
    size: 200
  }
}