Vue顶部tags浏览历史的实现

npm install element-resize-detector

<template>  <div>    <div class="tags">      <!-- 左箭头 -->      <div        class="arrow arrow_left"        v-show="arrowVisible"        @click="handleClickToLeft"      >        <i class="el-icon-arrow-left"></i>      </div>      <!-- 标签内容 -->      <div class="tags_content" ref="box">        <span ref="tags">          <el-tag            v-for="(tag, index) in tags"            :key="tag.name"            :class="[active == index ? 'active top_tags' : 'top_tags']"            effect="dark"            :closable="tag.name != 'Firstpage1'"            @close="handleClose(index, tag)"            @click="clickTag(index, tag)"            @contextmenu.native.prevent="handleClickContextMenu(index, tag)"          >            {{ $t("router." + tag.name) }}          </el-tag>        </span>      </div>      <!-- 右箭头 -->      <div        class="arrow arrow_right"        v-show="arrowVisible"        @click="handleClickToRight"      >        <i class="el-icon-arrow-right"></i>      </div>    </div>    <!-- 右键菜单 -->    <ul      v-show="contextMenu.isShow"      :style="{ left: contextMenu.menuLeft, top: '96px' }"      class="el-dropdown-menu el-popper"      x-placement="bottom-end"    >      <li        v-if="this.active == this.contextMenu.index"        class="el-dropdown-menu__item"        @click="refresh"      >        刷新      </li>      <li class="el-dropdown-menu__item" @click="closeRightTag">        关闭右侧      </li>      <li class="el-dropdown-menu__item" @click="closeOtherTag">        关闭其它      </li>      <div x-arrow="" class="popper__arrow" style="left: 44px;"></div>    </ul>  </div></template><script>import elementResizeDetectorMaker from "element-resize-detector";export default {  data() {    return {      // 是否有箭头      arrowVisible: true,      // 点击次数      num: 0,      active: 0,      tags: [],      // 右键的元素      contextMenu: {        index: 0,        tag: {},        menuLeft: 0,        isShow: false      }    };  },  watch: {    $route() {      this.getThisPage();    },    tags() {      this.listenFun(this.$refs.tags, "tags");    }  },  mounted() {    this.listenFun(this.$refs.box, "box");    var that = this;    document.addEventListener("click", function(e) {      that.contextMenu.isShow = false;    });  },  methods: {    // 监听可视区域宽,浏览器窗口大小改变执行    listenFun(monitor, dom) {      let boxWidth = this.$refs.box.offsetWidth,        tagsWidth = this.$refs.tags.offsetWidth,        erd = elementResizeDetectorMaker();      erd.listenTo(monitor, ele => {        this.$nextTick(() => {          if (            (dom == "box" && ele.offsetWidth >= tagsWidth) ||            (dom == "tags" && ele.offsetWidth <= boxWidth)          ) {            this.arrowVisible = false;            this.$refs.box.style.paddingLeft = "16px";            this.$refs.box.style.paddingRight = "16px";            this.$refs.box.style.transform = "TranslateX(0px)";            this.num = 0;          } else {            this.arrowVisible = true;            this.$refs.box.style.paddingLeft = "56px";            this.$refs.box.style.paddingRight = "56px";          }        });      });    },    // 判断当前页    getThisPage() {      let currentPgae = this.$route;      // 判断tags里是否有当前页面      var index = this.tags.findIndex(tag => tag.name == currentPgae.name);      if (index == -1) {        this.tags.push({          name: currentPgae.name,          path: currentPgae.path        });      }      // 当前选择页      this.active = this.tags.findIndex(tag => tag.name == currentPgae.name);    },    // 关闭标签    handleClose(index, tag) {      this.tags.splice(this.tags.indexOf(tag), 1);      if (index == this.tags.length) {        this.active = index - 1;        this.$router.push(this.tags[index - 1].path);      } else {        this.$router.push(this.tags[index].path);      }    },    // 点击标签    clickTag(index, tag) {      this.active = index;      this.$router.push(tag.path);    },    // 左侧按钮    handleClickToLeft() {      if (this.num > 0) {        this.num--;        this.$refs.box.style.transform = `TranslateX(-${this.num * 200}px)`;      }    },    // 右侧按钮    handleClickToRight() {      // 最后一个标签右测距离浏览器左侧距离      let lastChild = document        .querySelectorAll(".top_tags")        [this.tags.length - 1].getBoundingClientRect().right;      // 可视窗口的宽      let bodyWidth = document.body.offsetWidth;      // 右侧箭头48+右侧边距16      if (bodyWidth - lastChild <= 64) {        this.num++;        this.$refs.box.style.transform = `TranslateX(-${this.num * 200}px)`;      }    },    // 右键    handleClickContextMenu(index, tag) {      this.contextMenu.isShow = true;      this.contextMenu.index = index;      this.contextMenu.tag = tag;      let isTag = document        .querySelectorAll(".top_tags")        [index].getBoundingClientRect();      this.contextMenu.menuLeft = isTag.left - 48 + isTag.width / 2 + "px";    },    // 刷新    refresh() {      this.$router.go(0);    },    // 关闭其他    closeOtherTag() {      let tagsLin = this.tags.length,        { index, tag, menuLeft } = this.contextMenu;      if (index != 0) {        this.tags = [          {            name: "Firstpage1",            path: "/First/page1"          },          {            name: tag.name,            path: tag.path          }        ];      } else {        this.tags = [          {            name: "Firstpage1",            path: "/First/page1"          }        ];      }      this.active = index;      this.$router.push(tag.path);    },    // 关闭右侧    closeRightTag() {      let tagsLin = this.tags.length,        { index, tag, menuLeft } = this.contextMenu;      this.tags.splice(index + 1, tagsLin - index);      this.active = index;      this.$router.push(tag.path);    }  },  created() {    // 监听页面刷新    window.addEventListener("beforeunload", e => {      localStorage.setItem(        "tagInfo",        JSON.stringify({          active: this.active,          tags: this.tags        })      );    });    let tagInfo = localStorage.getItem("tagInfo")      ? JSON.parse(localStorage.getItem("tagInfo"))      : {          active: 0,          tags: [            {              name: "Firstpage1",              path: "/First/page1"            }          ]        };    this.active = tagInfo.active;    this.tags = tagInfo.tags;  }};</script><style lang="less" scoped>/deep/.el-tag--dark {  border-color: transparent;}/deep/.el-tag--dark .el-tag__close {  color: #86909c;  font-size: 16px;}/deep/.el-tag--dark .el-tag__close:hover {  background: #e7eaf0;}.tags {  position: relative;  overflow: hidden;  .arrow {    width: 48px;    text-align: center;    cursor: pointer;    background: #fff;    position: absolute;    z-index: 1;    &_left {      left: 0;      top: 0;    }    &_right {      right: 0;      top: 0;    }  }  &_content {    transition: 0.3s;    white-space: nowrap;    // padding: 0 16px;  }  .top_tags {    margin-right: 8px;    cursor: pointer;    background: #fff;    font-size: 12px;    font-weight: 400;    color: #1d2129;  }  .top_tags:hover,  .active,  .arrow:hover {    background: #e7eaf0;  }}</style>