text: const DRAWING_ITEMS = 'drawingItems'
  const DRAWING_ITEMS_VERSION = '1.2'
  const DRAWING_ITEMS_VERSION_KEY = 'DRAWING_ITEMS_VERSION'
  const DRAWING_ID = 'idGlobal'
  const TREE_NODE_ID = 'treeNodeId'
  const FORM_CONF = 'formConf'
  const CHECKED_COLUMNS = 'checkedColumns'
  
  export function getDrawingList(key) {
      // 加入缓存版本的概念，保证缓存数据与程序匹配
      const version = localStorage.getItem(DRAWING_ITEMS_VERSION_KEY)
      if (version !== DRAWING_ITEMS_VERSION) {
          localStorage.setItem(DRAWING_ITEMS_VERSION_KEY, DRAWING_ITEMS_VERSION)
          saveDrawingList([])
          return null
      }
  
      const str = localStorage.getItem(`${DRAWING_ITEMS}:${key}`)
      if (str) return JSON.parse(str)
      return null
  }
  
  export function saveDrawingList(list, key) {
      if (key) localStorage.setItem(`${DRAWING_ITEMS}:${key}`, JSON.stringify(list))
  }
  
  export function getIdGlobal(key) {
      const str = localStorage.getItem(`${DRAWING_ID}:${key}`)
      if (str) return parseInt(str, 10)
      return 100
  }
  
  export function saveIdGlobal(id, key) {
  
      if (key) localStorage.setItem(`${DRAWING_ID}:${key}`, `${id}`)
  }
  
  export function getTreeNodeId() {
      const str = localStorage.getItem(TREE_NODE_ID)
      if (str) return parseInt(str, 10)
      return 100
  }
  
  export function saveTreeNodeId(id) {
      localStorage.setItem(TREE_NODE_ID, `${id}`)
  }
  
  export function getFormConf(key) {
      const str = localStorage.getItem(`${FORM_CONF}:${key}` + key)
      if (str) return JSON.parse(str)
      return null
  }
  
  export function saveFormConf(obj, key) {
      if (key) localStorage.setItem(`${FORM_CONF}:${key}`, JSON.stringify(obj))
  }
  
  export function saveCheckedColumn(key, obj) {
      if (key) localStorage.setItem(`${CHECKED_COLUMNS}:${key}`, JSON.stringify(obj))
  }
  
  export function getCheckedColumn(key) {
      const str = localStorage.getItem(`${CHECKED_COLUMNS}:${key}`)
      if (str) return JSON.parse(str)
      return null
  }
  