不依任何赖第三方,单纯用vue实现Tree 树形控件的案例

treeData: [
    {open: false, name: '1', level: 0, checked: true},
    {
     open: false, // opend 是否展开子集
     name: '2',
     level: 0, //level代表第几层
     checked: false, // checked 代表是否选中状态
     children: [
      {
       open: false,
       name: '3',
       level: 1,
       checked: false,
       children: [
        {open: false, name: '4', level: 2, checked: false},
        {
         open: false,
         name: '5',
         level: 2,
         checked: false
        }
       ]
      }
     ]
    }
   ],

watch: {
  // 深度监听 treeDate的数据变化 用 deep
  treeData: {
   handler: function (newVal, oldVal) {
    this.calculateSelectFormResult()
   },
   deep: true
  }
 }

calculateSelectFormResult: function () {
   var arr = []
   function f (obj) {
    for (var i in obj) {
     if (obj[i].checked) {
      // console.log(2)
      arr.push(obj[i].name)
     }
     if (obj[i].children) {
      if (obj[i].children.length !== 0) {
       f(obj[i].children)
      }
     }
    }
   }
   f(this.treeData)
   this.selectFormResult = arr
   console.log(this.selectFormResult)
  }