text: const state = {
    visitedViews: [],
    cachedViews: [],
    curCachedView: {}, // 当前视图 暂未使用
  }
  
  const mutations = {
    ADD_VISITED_VIEW: (state, view) => {
      if (state.visitedViews.some(v => v.path === view.path)) return
      state.visitedViews.push(
        Object.assign({}, view, {
          title: view.meta.title || 'no-name'
        })
      )
    },
    ADD_CACHED_VIEW: (state, view) => {
      if (state.cachedViews.includes(view.name)) return
      if (!view.meta.noCache) {
        state.cachedViews.push(view.name)
      }
    },
  
    DEL_VISITED_VIEW: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews.splice(i, 1)
          break
        }
      }
    },
    DEL_CACHED_VIEW: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      index > -1 && state.cachedViews.splice(index, 1)
    },
  
    DEL_OTHERS_VISITED_VIEWS: (state, view) => {
      state.visitedViews = state.visitedViews.filter(v => {
        return v.meta.affix || v.path === view.path
      })
    },
    DEL_OTHERS_CACHED_VIEWS: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      if (index > -1) {
        state.cachedViews = state.cachedViews.slice(index, index + 1)
      } else {
        // if index = -1, there is no cached tags
        state.cachedViews = []
      }
    },
  
    DEL_ALL_VISITED_VIEWS: state => {
      // keep affix tags
      const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
      state.visitedViews = affixTags
    },
    DEL_ALL_CACHED_VIEWS: state => {
      state.cachedViews = []
    },
  
    UPDATE_VISITED_VIEW: (state, view) => {
      for (let v of state.visitedViews) {
        if (v.path === view.path) {
          v = Object.assign(v, view)
          break
        }
      }
    },
  
    UPDATE_CUR_CACHED_VIEW: (state, view) => {
      state.curCachedView = view
    }
  }
  
  const actions = {
    addView({dispatch}, view) {
      dispatch('addVisitedView', view)
      dispatch('addCachedView', view)
    },
    addVisitedView({commit}, view) {
      commit('ADD_VISITED_VIEW', view)
    },
    addCachedView({commit}, view) {
      commit('ADD_CACHED_VIEW', view)
    },
  
    delView({dispatch, state}, view) {
      return new Promise(resolve => {
        dispatch('delVisitedView', view)
        dispatch('delCachedView', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delVisitedView({commit, state}, view) {
      return new Promise(resolve => {
        commit('DEL_VISITED_VIEW', view)
        resolve([...state.visitedViews])
      })
    },
    delCachedView({commit, state}, view) {
      return new Promise(resolve => {
        commit('DEL_CACHED_VIEW', view)
        resolve([...state.cachedViews])
      })
    },
  
    delOthersViews({dispatch, state}, view) {
      return new Promise(resolve => {
        dispatch('delOthersVisitedViews', view)
        dispatch('delOthersCachedViews', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delOthersVisitedViews({commit, state}, view) {
      return new Promise(resolve => {
        commit('DEL_OTHERS_VISITED_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delOthersCachedViews({commit, state}, view) {
      return new Promise(resolve => {
        commit('DEL_OTHERS_CACHED_VIEWS', view)
        resolve([...state.cachedViews])
      })
    },
  
    delAllViews({dispatch, state}, view) {
      return new Promise(resolve => {
        dispatch('delAllVisitedViews', view)
        dispatch('delAllCachedViews', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delAllVisitedViews({commit, state}) {
      return new Promise(resolve => {
        commit('DEL_ALL_VISITED_VIEWS')
        resolve([...state.visitedViews])
      })
    },
    delAllCachedViews({commit, state}) {
      return new Promise(resolve => {
        commit('DEL_ALL_CACHED_VIEWS')
        resolve([...state.cachedViews])
      })
    },
  
    updateVisitedView({commit}, view) {
      commit('UPDATE_VISITED_VIEW', view)
    },
  
    updateCurCachedView({commit}, view) {
      commit('UPDATE_CUR_CACHED_VIEW', view)
    }
  }
  
  export default {
    namespaced: true,
    state,
    mutations,
    actions
  }
  