element-ui中点击菜单,改变当前菜单背景颜色

需求: vue项目中,点击左侧菜单,tags页显示当前打开的菜单,而且高亮显示当前菜单

实现效果:

实现代码:在vuex里面定义tags存放全部打开的菜单,和当前打开的索引curtagsIndex:,经过遍历tags,看是否等于当前索引

1.在store的index.js文件里面定义tags和curtagsIndex

const store = new Vuex.Store({ modules: { tags:[], curTagsIndex:"-1", }, mutations: { SET_CURTAGS: (state, index) => { state.curTagsIndex = index }, } })  

 

<div class="tag_list" v-for="(tag,index) in tags" @click="jump(tag)" :class="{ active:curTagsIndex == index}">
        <span>{{tag.name}}</span>
        <i class="el-icon-close" @click="close(tag)"></i>
      </div>



<script> import { mapState, mapGetters,mapMutations } from "vuex"; export default{ computed: { ...mapGetters(["tags","curTagsIndex"]), }, methods:{ ...mapMutations(["SET_CURTAGS"]), jump(val){ this.$router.push(val.path); this.tags.forEach((item,index)=>{ if(item.name==val.name){ this.$store.commit("SET_CURTAGS",index); } }) }, }, } </script>
<style lang="less" scoped> .active{ background:#f1f4f5;

  }

</style>