Vue3实现前端权限级别按钮控制

编写permission.vue

组件中的按钮设置为：增加、修改和删除三个按钮，为了让button按钮disabled时，可以让tooltip继续有效，在button外层加了个span。为了通过自定义指令中方便控制tooltip，vue3好像必须把自定义指令放在tooltip的外层，所以又在tooltip外层加了个span以放在自定义指令v-has。

<template>
  <el-card class="query-condition">
    <el-form :inline="true" :model="PermissionQuery" class="demo-form-inline">
      <el-form-item>
        <span v-has="'/sys/permission_edit'">
          <el-tooltip placement="top" content="无权访问,请联系管理员" type="tooltip" disabled>
            <span>
              <el-button type="primary" @click="PermissionAdd()">新增</el-button>
            </span>
          </el-tooltip>
        </span>
      </el-form-item>
      <el-form-item label="权限名称：">
        <el-input v-model="PermissionQuery.title" placeholder="请输入权限名称" />
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onQuery(PermissionQuery)">查询</el-button>
      </el-form-item>
    </el-form>
  </el-card>
  <el-row>
    <el-col :span="24">
      <el-table border :data="table.data">
        <el-table-column label="#" width="80" align="center" prop="id"></el-table-column>
        <el-table-column label="权限名称" align="center" prop="title"></el-table-column>
        <el-table-column label="URL地址" align="center" prop="url"></el-table-column>
        <el-table-column label="所属菜单" align="center" prop="menuname.menuname"></el-table-column>
        <el-table-column label="显示顺序" align="center" prop="sort" width="90"></el-table-column>
        <el-table-column label="路由文件" align="center" prop="route"></el-table-column>
        <el-table-column label="权限说明" align="center" prop="description"></el-table-column>
        <el-table-column label="操作" width="150px" align="center">
          <template #default="scope">
            <span v-has="'/sys/permission_edit'">
              <el-tooltip placement="top-end" content="无权访问,请联系管理员" type="tooltip" disabled>
                <span>
                  <el-button type="primary" size="small" @click="PermissionEdit(scope.row)">
                    <el-icon>
                      <Edit />
                    </el-icon>
                  </el-button>
                </span>
              </el-tooltip>
            </span>
            <span v-has="'/sys/permission_del'">
              <el-tooltip placement="top-end" content="无权访问,请联系管理员" type="tooltip" disabled>
                <span>
                  <el-button type="danger" size="small" @click="PermissionDel(scope.row.id)">
                    <el-icon>
                      <Delete />
                    </el-icon>
                  </el-button>
                </span>
              </el-tooltip>
            </span>
          </template>
        </el-table-column>
      </el-table>
      <PaginationView :total="total" @pageChange="handleChangePage"></PaginationView>
    </el-col>
  </el-row>
  <el-dialog v-model="dialogFormVisible" :title="form_state ? '权限新增' : '权限修改'" :close-on-click-modal="false" width="400px" center :before-close="formCancel">
    <el-form :model="formData" :rules="rules" ref="editForm">
      <el-form-item v-show="false" label="#" prop="id">
        <el-input type="hidden" v-model="formData.id"></el-input>
      </el-form-item>
      <el-form-item label="权限名称" prop="title">
        <el-input v-model="formData.title"></el-input>
      </el-form-item>
      <el-form-item label="URL地址" prop="url">
        <el-input v-model="formData.url"></el-input>
      </el-form-item>
      <el-form-item label="所属菜单" prop="menuid">
        <el-select v-model="formData.menuid" placeholder="请选择所属菜单" style="width: 100%" clearable>
          <el-option v-for="(menu, index) in menus.data" :key="index" :label="menu.menuname" :value="menu.id" />
        </el-select>
      </el-form-item>
      <el-form-item label="路由文件" prop="route">
        <el-input v-model="formData.route"></el-input>
      </el-form-item>
      <el-form-item label="显示顺序" prop="sort">
        <el-input v-model="formData.sort"></el-input>
      </el-form-item>
      <el-form-item label="权限说明" prop="description">
        <el-input v-model="formData.description"></el-input>
      </el-form-item>
    </el-form>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="formCancel()">取消</el-button>
        <el-button type="primary" @click="formSubmit()">提交</el-button>
      </span>
    </template>
  </el-dialog>
</template>

2、自定义指令组件（utils/haspermissions.js）

export const hasPermission = {
    install(Vue) {
        //自定义指令v-has：
        Vue.directive('has', {
            mounted(el, binding, vnode) {
                if (!checkPermission(binding.value)) {
                    let tooltipNode = vnode.children.find((childrenCmpt) => childrenCmpt.component?.type.name == 'ElTooltip')
                    tooltipNode.component.props.disabled = false
                    el.querySelector("button").setAttribute("disabled", true)
                }
            },
        });
        //权限检查方法
        function checkPermission(value) {
            let isExist = false;
            let userlogin = JSON.parse(sessionStorage.getItem("userlogin") || "[]");
            let buttonArr = userlogin.haspermissions
            //判断是否按钮有权限
            if (buttonArr.includes(value)) {
                isExist = true;
            }
            return isExist;
        }
    }
};
export default hasPermission;

3.将自定义指令加入vue3的全局指令，以方便所有组件中可以使用（在main.js中引入自定义指令组件然后use注册）。