var api = {
  ...
  menu:{
    create:prefix+'/menu/create?', //access_token=ACCESS_TOKEN 创建菜单
    get:prefix+'/menu/get?', //access_token=ACCESS_TOKE 获取菜单,GET请求
    delete:prefix+'/menu/delete?', //access_token=ACCESS_TOKEN 删除菜单,GET请求
    getInfo:prefix+'get_current_selfmenu_info?' //access_token=ACCESS_TOKEN 获取自定义菜单配置接口
  }
}

Wechat.prototype.createMenu = function(menu){
  var that = this;
  return new Promise(function(resolve,reject){
    that.fetchAccessToken().then(function(data){
      var url = api.menu.create + 'access_token=' + data.access_token;
      request({url:url,method:'POST',body:menu,json:true}).then(function(response){
        var _data = response.body;
        if(_data.errcode === '0'){
          resolve();
        }else{
          throw new Error('create menu failed!');
        }
      }).catch(function(err){
        reject(err);
      });
    });
  });
}

/*
 * 配置自定义菜单
 */
'use strict'

module.exports = {
  'button':[
  {
    'name':'最新',
    'type':'click',
    'key':'menu_click'
  },
  {
    'name':'类别',
    'sub_button':[
      {
        'name':'科幻',
        'type':'view',
        'url':'music.163.com'
      },
      {
        'name':'悬疑',
        'type':'scancode_push',
        'key':'qr_scan'
      },
      {
        'name':'爱情',
        'type':'scancode_waitmsg',
        'key':'qr_scan_wait'
      },
      {
        'name':'教育',
        'type':'pic_photo_or_album',
        'key':'pic_photo_album'
      }
    ]
  },
  {
    'name':'地域',
    'sub_button':[
      {
        'name':'大陆',
        'type':'pic_weixin',
        'key':'pic_weixin'
      },
      {
        'name':'欧美',
        'type':'location_select',
        'key':'location_select'
      }
    ]
  }]
}

wechatApi.deleteMenu().then(function(){
  return wechatApi.createMenu(menu);
}).then(function(msg){
  console.log(msg);
});

Wechat.prototype.deleteMenu = function(){
  var that = this;
  return new Promise(function(resolve,reject){
    that.fetchAccessToken().then(function(data){
      var url = api.menu.delete + 'access_token=' + data.access_token;
      request({url:url,json:true}).then(function(response){
        var _data = response.body;
        if(_data.errcode === '0'){
          resolve();
        }else{
          throw new Error('delete menu failed!');
        }
      }).catch(function(err){
        reject(err);
      });
    });
  });
}