node.js开发之函数嵌套使其顺序执行

最新推荐文章于 2025-05-21 14:30:46 发布

from_lazy_boy

最新推荐文章于 2025-05-21 14:30:46 发布

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分类专栏： node.js 文章标签： node.js

本文链接：https://blog.youkuaiyun.com/u013310075/article/details/28906227

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本文介绍了一个基于Node.js实现的角色基础访问控制(RBAC)系统。该系统定义了多种权限，如创建、读取、更新和删除不同类型的资源，并通过嵌套函数的方式实现了角色权限的创建和分配。

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// permissions.js

var rbac = require('mongoose-rbac')
  , Permission = rbac.Permission
  , Role = rbac.Role
  , permissions;

permissions = [
    { subject: 'Post', action: 'create' }
  , { subject: 'Post', action: 'read' }
  , { subject: 'Post', action: 'update' }
  , { subject: 'Post', action: 'delete' }
  , { subject: 'Comment', action: 'create' }
  , { subject: 'Comment', action: 'read' }
  , { subject: 'Comment', action: 'update' }
  , { subject: 'Comment', action: 'delete' }
  , { subject: 'Preference', action: 'create' }
  , { subject: 'Preference', action: 'read' }
  , { subject: 'Preference', action: 'update' }
  , { subject: 'Preference', action: 'delete' }
];

Permission.create(permissions, function (err) {
  var perms, admin, developer, readonly;

  perms = Array.prototype.slice.call(arguments, 1);

  admin = new Role({ name: 'admin' });
  admin.permissions = perms;
  admin.save(function (err, admin) {
    developer = new Role({ name: 'developer' });
    developer.permissions = perms.slice(0, 7);
    developer.save(function (err, developer) {
      readonly = new Role({ name: 'readonly' });
      readonly.permissions = [perms[1], perms[5], perms[9]];
      readonly.save(function (err, readonly) {
        // ...
      });
    });
  });
});

像上面admin.save()使用了函数嵌套,这样做的好处就是使其顺序执行.