实现的效果图

Vue实现TagView标签导航栏缓存，解决重新进去页面不刷新问题

一、先实现导航栏的效果

1、先在@/layout/components/Sidebar目录下新建一个组件ScrollPane.vue，把下面代码复制进去

<template>
  <div ref="scrollContainer" class="scroll-container" @wheel.prevent="handleScroll">
    <div ref="scrollWrapper" class="scroll-wrapper" :style="{left: left + 'px'}">
      <slot />
    </div>
  </div>
</template>
<script>
const padding = 15 // tag's padding
export default {
  name: 'ScrollPane',
  data() {
    return {
      left: 0
    }
  },
  methods: {
    handleScroll(e) {
      const eventDelta = e.wheelDelta || -e.deltaY * 3// wheelDelta:-120;deltaY:-120
      const $container = this.$refs.scrollContainer// 外面的container
      const $containerWidth = $container.offsetWidth// 外面的container的宽度
      const $wrapper = this.$refs.scrollWrapper// 里面
      const $wrapperWidth = $wrapper.offsetWidth// 里面的宽度
      if (eventDelta > 0) {
        this.left = Math.min(0, this.left + eventDelta)// min() 方法可返回指定的数字中带有最低值的数字。
      } else {
        if ($containerWidth - padding < $wrapperWidth) {
          if (this.left < -($wrapperWidth - $containerWidth + padding)) {
            this.left = 1
          } else {
            this.left = Math.max(this.left + eventDelta, $containerWidth - $wrapperWidth - padding)
          }
        } else {
          this.left = 0
        }
      }
    },
    moveToTarget($target) {
      const $container = this.$refs.scrollContainer
      const $containerWidth = $container.offsetWidth
      const $targetLeft = $target.offsetLeft
      const $targetWidth = $target.offsetWidth
      if ($targetLeft < -this.left) {
        // tag in the left
        this.left = -$targetLeft + padding
      } else if ($targetLeft + padding > -this.left && $targetLeft + $targetWidth < -this.left + $containerWidth - padding) {
        // tag in the current view
          // eslint-disable-line
      } else {
        // tag in the right
        this.left = -($targetLeft - ($containerWidth - $targetWidth) + padding)
      }
    }
  }
}
</script>
<style rel="stylesheet/scss" lang="scss" scoped>
  .scroll-container {
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    width: 100%;
    .scroll-wrapper {
      position: absolute;
    }
  }
</style>

2、在相同目录下再新建一个TagsView.vue组件，把下面代码复制进去

<template>
  <div class="tags-view-container">
    <scroll-pane ref="scrollPane" class="tags-view-wrapper">
      <router-link
        v-for="tag in Array.from(visitedViews)"
        ref="tag"
        :key="tag.path"
        :class="isActive(tag)?'active':''"
        :to="tag"
        class="tags-view-item"
        @contextmenu.prevent.native="openMenu(tag,$event)"
      >
        {{ tag.title }}
        <span class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)" />
      </router-link>
    </scroll-pane>
    <ul v-show="visible" class="contextmenu" :style="{left:left+'px',top:top+'px'}">
      <li @click="closeSelectedTag(selectedTag)">关闭</li>
      <li @click="closeOthersTags">关闭其他</li>
      <li @click="closeAllTags">关闭所有</li>
    </ul>
  </div>
</template>
<script>
import ScrollPane from './ScrollPane.vue'
export default {
  name: 'TagsView',
  components: { ScrollPane },
  data() {
    return {
      visible: false,
      top: 0,
      left: 0,
      selectedTag: {}
    }
  },
  computed: {
    visitedViews() {
      return this.$store.state.tagsView.visitedViews
    }
  },
  watch: {
    $route() {
      this.addViewTags()
      this.moveToCurrentTag()
    },
    visible(value) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu)
      } else {
        document.body.removeEventListener('click', this.closeMenu)
      }
    }
  },
  mounted() {
    this.addViewTags()
  },
  methods: {
    generateRoute() {
      if (this.$route.name) {
        return this.$route
      }
      return false
    },
    isActive(route) {
      return route.path === this.$route.path
    },
    addViewTags() {
      const route = this.generateRoute()
      if (!route) {
        return false
      }
      this.$store.dispatch('addVisitedViews', route)
    },
    moveToCurrentTag() {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag.$el)
            break
          }
        }
      })
    },
    closeSelectedTag(view) {
      this.$store.dispatch('delVisitedViews', view).then((views) => {
        if (this.isActive(view)) {
          const latestView = views.slice(-1)[0]
          if (latestView) {
            this.$router.push(latestView)
          } else {
            this.$router.push('/')
          }
        }
      })
    },
    closeOthersTags() {
      this.$router.push(this.selectedTag)
      this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
        this.moveToCurrentTag()
      })
    },
    closeAllTags() {
      this.$store.dispatch('delAllViews')
      this.$router.push('/')
    },
    openMenu(tag, e) {
      this.visible = true
      this.selectedTag = tag
      const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
      this.left = e.clientX - offsetLeft + 15 // 15: margin right
      this.top = e.clientY
    },
    closeMenu() {
      this.visible = false
    }
  }
}
</script>
<style rel="stylesheet/scss" lang="scss" scoped>
  .tags-view-container {
    .tags-view-wrapper {
      background: #fff;
      height: 34px;
      border-bottom: 1px solid #d8dce5;
      box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);
      .tags-view-item {
        display: inline-block;
        position: relative;
        height: 26px;
        line-height: 26px;
        border: 1px solid #d8dce5;
        color: #495060;
        background: #fff;
        padding: 0 8px;
        font-size: 12px;
        margin-left: 5px;
        margin-top: 4px;
        &:first-of-type {
          margin-left: 15px;
        }
        &.active {
          background-color: #42b983;
          color: #fff;
          border-color: #42b983;
          &::before {
            content: '';
            background: #fff;
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            position: relative;
            margin-right: 2px;
          }
        }
      }
    }
    .contextmenu {
      margin: 0;
      background: #fff;
      z-index: 100;
      position: absolute;
      list-style-type: none;
      padding: 5px 0;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 400;
      color: #333;
      box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);
      li {
        margin: 0;
        padding: 7px 16px;
        cursor: pointer;
        &:hover {
          background: #eee;
        }
      }
    }
  }
</style>
<style rel="stylesheet/scss" lang="scss">
  //reset element css of el-icon-close
  .tags-view-wrapper {
    .tags-view-item {
      .el-icon-close {
        width: 16px;
        height: 16px;
        vertical-align: 2px;
        border-radius: 50%;
        text-align: center;
        transition: all .3s cubic-bezier(.645, .045, .355, 1);
        transform-origin: 100% 50%;
        &:before {
          transform: scale(.6);
          display: inline-block;
          vertical-align: -3px;
        }
        &:hover {
          background-color: #b4bccc;
          color: #fff;
        }
      }
    }
  }
</style>

3、在store文件夹下新建一个tagsView.js，同样把复制代码进去

const tagsView = {
  state: {
    visitedViews: [],
    cachedViews: []
  },
  mutations: {
    ADD_VISITED_VIEWS: (state, view) => {
      if (state.visitedViews.some(v => v.path === view.path)) return
      state.visitedViews.push(Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      }))
      if (!view.meta.noCache) {
        state.cachedViews.push(view.name)
      }
    },
    DEL_VISITED_VIEWS: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews.splice(i, 1)
          break
        }
      }
      for (const i of state.cachedViews) {
        if (i === view.name) {
          const index = state.cachedViews.indexOf(i)
          state.cachedViews.splice(index, 1)
          break
        }
      }
    },
    DEL_OTHERS_VIEWS: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews = state.visitedViews.slice(i, i + 1)
          break
        }
      }
      for (const i of state.cachedViews) {
        if (i === view.name) {
          const index = state.cachedViews.indexOf(i)
          state.cachedViews = state.cachedViews.slice(index, i + 1)
          break
        }
      }
    },
    DEL_ALL_VIEWS: (state) => {
      state.visitedViews = []
      state.cachedViews = []
    }
  },
  actions: {
    addVisitedViews({ commit }, view) {
      commit('ADD_VISITED_VIEWS', view)
    },
    delVisitedViews({ commit, state }, view) {
      return new Promise((resolve) => {
        commit('DEL_VISITED_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delOthersViews({ commit, state }, view) {
      return new Promise((resolve) => {
        commit('DEL_OTHERS_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delAllViews({ commit, state }) {
      return new Promise((resolve) => {
        commit('DEL_ALL_VIEWS')
        resolve([...state.visitedViews])
      })
    }
  }
}
export default tagsView

4、在store/index.js中引入tagsView.js

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'
// 自定义模块
import app from './modules/app'
import settings from './modules/settings'
import user from './modules/user'
import permission from './modules/permission'
import tagsView from './modules/tagsView'
Vue.use(Vuex)
const store = new Vuex.Store({
  modules: {
    app,
    settings,
    user,
    permission,
    tagsView
  },
  getters
})
export default store

5、在@/layout/的主组件中引入TagsView组件

Vue实现TagView标签导航栏缓存，解决重新进去页面不刷新问题

二、实现重新返回页面时不刷新，保留原本页面内容

1、在@/layout/components/Sidebar下的AppMain.vue中添加如下代码

主要是通过keep-alive 和 router-view结合来实现

<template>
  <section class="app-main">
    <transition name="fade-transform" mode="out-in">
      <keep-alive :include="cachedViews"> //这是新增加的
        <router-view :key="key" />
      </keep-alive> //
    </transition>
  </section>
</template>
<script>
export default {
  name: 'AppMain',
  computed: {
    key() {
      return this.$route.path
    },
    cachedViews() {//这是新增加的
      return this.$store.state.tagsView.cachedViews
    }//
  }
}
</script>

2、在route/index.js中为页面路由添加keepAlive为true，例如在首页

  {
    path: '/',
    component: Layout,
    redirect: '/dashboard',
    children: [{
      path: 'dashboard',
      name: 'Dashboard',
      component: () => import('@/views/dashboard/index'),
      //在meta对象中添加key值keepAlive为true
      meta: { title: '首页', icon: 'dashboard' ,keepAlive:true} 
    }]
  }

3、还有一点很重要！！要确保组件的命名和路由的命名是一样的，不然页面不会保留原本内容，会进行自动刷新

Vue实现TagView标签导航栏缓存，解决重新进去页面不刷新问题

4、退出登录时，要清除缓存可以在store/modules/user.js中添加如下代码

import store from '..'
// user logout
  logout({ commit, state }) {
    return new Promise((resolve, reject) => {
      logout().then(() => {
        removeToken() 
        resetRouter()
        store.dispatch('delAllViews') //增加多这行
        commit('RESET_STATE')
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

最后，这是项目的目录结构，红色框是新建的文件，蓝色是修改增加的文件

 Vue实现TagView标签导航栏缓存，解决重新进去页面不刷新问题

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