new Vue({
  el: '#app',
  data: {
    obj: [{
      id: 1,
      selected: 0,
      arr: [1, 2]
    },
          {
            id: 2,
            selected: 2,
            arr: [1, 2, 3]
          },
          {
            id: 3,
            selected: 1,
            arr: [1]
          },
          {
            id: 4,
            selected: -1,
            arr: []
          }
         ]
  },
  methods: {
    //加一列
    addModel() {
      var l = this.obj.length
      if (l > 7) {
        alert('再加，自动换行会变形的！！！！！！！')
      } else {
        var nullModel = {
          id: l + 1,
          selected: -1,
          arr: []
        }
        this.obj.push(nullModel)
      }
    },
    //加一行
    addBox(k) {
      var num = this.obj[k].arr.length + 1;
      this.obj[k].arr.push(num)
    },
    //选中当前列中的数据
    selectFun(k, index) {
      this.obj[k].selected = index;
    }
  }
})