vue+element下拉菜单添加事件

     <el-dropdown @command="handleCommand" v-if="this.$store.state.deptId == 1">           <img class="el-dropdown-link" src="../assets/20191207图标/20191207图标/首页.png" />           <el-dropdown-menu slot="dropdown">             <el-dropdown-item command="userGroup">用户分组管理</el-dropdown-item>             <el-dropdown-item command="userGroup2">PMS信息导入</el-dropdown-item>             <el-dropdown-item command="userGroup3">更新对比数据</el-dropdown-item>           </el-dropdown-menu>         </el-dropdown>         userGroup() {       this.$router.push("/dept_user");     },     userGroup2() {       alert(2);     },     userGroup3() {       alert(3);     },       handleCommand(cmditem) {       if (!cmditem) {         console.log("test");         this.$message("菜单选项缺少command属性");         return;       }       switch (cmditem) {         case "userGroup":           this.userGroup();           break;         case "userGroup2":           this.userGroup2();           break;         case "userGroup3":           this.userGroup3();           break;       }     },
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