text: /*
  * @Author: sunlandong
  * @Date:   2017-03-11 12:06:49
  * @Last Modified by:   sunlandong
  * @Last Modified time: 2017-03-11 16:30:03
  */
  
  
  import Vue from 'vue'
  function DataTransfer (data) {
      if (!(this instanceof DataTransfer)) {
          return new DataTransfer(data, null, null)
      }
  }
  
  
  DataTransfer.treeToArray = function (data, parent, level, expandedAll) {
      let tmp = []
      Array.from(data).forEach(function (record) {
          if (record._expanded === undefined) {
              Vue.set(record, '_expanded', expandedAll)
          }
          if (parent) {
              Vue.set(record, '_parent', parent)
          }
          let _level = 0
          if (level !== undefined && level !== null) {
              _level = level + 1
          }
          Vue.set(record, '_level', _level)
          tmp.push(record)
          if (record.children && record.children.length > 0) {
              let children = DataTransfer.treeToArray(record.children, record, _level, expandedAll)
              tmp = tmp.concat(children)
          }
      })
      return tmp
  }
  
  
  export default DataTransfer
  