递归，闭包，变量，死循环（心态炸了......）

handleItemChange(val) {
      console.log(val, '----')
      console.log(this.defaultOptions, '二二二')
      var code = val[val.length - 1]

      var level = this.getlevel(code, this.defaultOptions) //递归执行函数
      console.log(level, '递归查出来的level')

      this.defaultOptions = this.handleData(this.defaultOptions, code, level)
    },
    //递归查divlevel
    getlevel(code, defaultOptions) {
      console.log(code, defaultOptions, '555555')
      let divLevel = ''
      defaultOptions.forEach(item => {
        if (item.divCode === code) {
          divLevel = item.divLevel
        } else {
          let tmp = this.getlevel(code, item.children)
          if (tmp && tmp.length != 0) {
            divLevel = tmp
            return tmp
          }
        }
      })
      return divLevel
    }