/**
 * TabLayout.vue 的模板部分，簡單看一下有個印象
 */
<template>
 <PageLayout>
 <ContextMenu
 :list="menuItems"
 :visible.sync="menuVisible"
 @select="onMenuSelect"
 />
 <!-- 標簽部分 -->
 <a-tabs
 type="editable-card"
 :hide-add="true"
 :active-key="activePage"
 @change="changePage"
 @edit="editPage"
 @contextmenu="onContextmenu"
 >
 <a-tab-pane v-for="page in pageList" :key="page.fullPath">
 <template #tab>
  <span :data-key="page.fullPath">
  {{ page.name }}
  </span>
 </template>
 </a-tab-pane>
 </a-tabs>
 <!-- 路由出口 -->
 <PageToggleTransition name="fadeIn">
 <keep-alive :exclude="dustbin">
 <router-view />
 </keep-alive>
 </PageToggleTransition>
 </PageLayout>
</template>

watch: {
 $route: {
 handler (route) {
 this.activePage = route.fullPath
 this.putCache(route)
 const index = this.pageList.findIndex(item => item.fullPath === route.fullPath)
 if (index === -1) {
  this.pageList.push(route)
 }
 },
 immediate: true
 }
}

methods: {
 changePage (key) {
 this.activePage = key
 this.$router.push(key)
 },
 editPage (key, action) {
 if (action === 'remove') {
 this.remove(key)
 }
 },
 remove (key) {
 if (this.pageList.length <= 1) {
 return message.info('最后一頁了哦~')
 }
 let curIndex = this.pageList.findIndex(item => item.fullPath === key)
 const { matched } = this.pageList[curIndex]
 const componentName = last(matched).components.default.name
 this.dustbin.push(componentName)
 this.pageList.splice(curIndex, 1)
 // 如果刪除的是當前頁才需要跳轉
 if (key === this.activePage) {
 // 判斷向左跳還是向右跳
 curIndex = curIndex >= this.pageList.length ? this.pageList.length - 1 : curIndex
 const page = this.pageList[curIndex]
 this.$router.push(page.fullPath).finally(() => {
  this.dustbin.splice(0) // 重置，否則會影響到某些組件的緩存
 })
 }
 }
 ...
 ...
}

methods: {
 // 自定義右鍵菜單的關閉功能
 onContextmenu (e) {
 const key = getTabKey(e.target) // 這里的判斷，用到了前面在span標簽上加的data-key自定義屬性
 if (!key) return // 主要是為了控制菜單的顯示或隱藏

 e.preventDefault() // 組織默認行為，顯示我們的自定義郵件菜單
 this.menuVisible = true
 }
 ...
 ...
}
/**
 * 由于ant-design-vue組件庫的TabPane組件暫不支持自定義監(jiān)聽器，無法直接獲取到右鍵target所在標簽頁的key 。故增加此方法用于
 * 查詢右鍵target所在標簽頁的標識 key ，以用于自定義右鍵菜單的事件處理。
 * 注：TabPane組件支持自定義監(jiān)聽器后可去除該方法并重構 ‘自定義右鍵菜單的事件處理'
 * @param target 查詢開始目標
 * @param depth 查詢層級深度 （查找層級最多不超過3層，超過3層深度直接返回 null）
 * @returns {String}
 */
function getTabKey (target, depth = 0) {
 if (depth > 2 || !target) {
 return null
 }
 return target.dataset.key || getTabKey(target.firstElementChild, ++depth)
}

<template>
 <a-menu
 v-show="visible"
 class="contextmenu"
 :style="style"
 :selectedKeys="selectedKeys"
 @click="handleClick"
 >
 <a-menu-item v-for="item in list" :key="item.key">
 <a-icon v-if="item.icon" :type="item.icon"/>
 <span>{{ item.text }}</span>
 </a-menu-item>
 </a-menu>
</template>

<script>
export default {
 name: 'ContextMenu',
 props: {
 visible: {
 type: Boolean,
 required: false,
 default: false
 },
 list: {
 type: Array,
 required: true,
 default: () => []
 }
 },
 data () {
 return {
 left: 0,
 top: 0,
 target: null,
 selectedKeys: []
 }
 },
 computed: {
 style () {
 return {
 left: this.left + 'px',
 top: this.top + 'px'
 }
 }
 },
 created () {
 const clickHandler = () => this.closeMenu()
 const contextMenuHandler = e => this.setPosition(e)
 window.addEventListener('click', clickHandler)
 window.addEventListener('contextmenu', contextMenuHandler)
 this.$emit('hook:beforeDestroy', () => {
 window.removeEventListener('click', clickHandler)
 window.removeEventListener('contextmenu', contextMenuHandler)
 })
 },
 methods: {
 closeMenu () {
 this.$emit('update:visible', false)
 },
 setPosition (e) {
 this.left = e.clientX
 this.top = e.clientY
 this.target = e.target
 },
 handleClick ({ key }) {
 this.$emit('select', key, this.target)
 this.closeMenu()
 }
 }
}
</script>

<style lang="stylus" scoped>
 .contextmenu
 position fixed
 z-index 1000
 border-radius 4px
 border 1px lightgrey solid
 box-shadow 4px 4px 10px lightgrey !important
 .ant-menu-item
 margin 0 !important
</style>

onMenuSelect (key, target) {
 const tabKey = getTabKey(target)
 switch (key) {
 case '1': this.closeLeft(tabKey); break
 case '2': this.closeRight(tabKey); break
 case '3': this.closeOthers(tabKey); break
 default: break
 }
}

closeOthers (tabKey) {
 const index = this.pageList.findIndex(item => item.fullPath === tabKey) // 找到觸發(fā)事件時鼠標停留在那個tab上
 for (const route of this.pageList) {
 if (route.fullPath !== tabKey) {
  this.clearCache(route) // 清緩存
 }
 }
 const page = this.pageList[index]
 this.pageList = 
                            
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