text: function xpm(opt) {
    this.opt = opt || {};
  
    this.require = function(service_name, params) {
      var se = require('./service' + '/' + service_name.toLowerCase() + '.js');
      params = params || {};
      return new se(this.opt, params);
    };
  
    /**
     * 设定配置信息
     * @param  array option 设置或读取配置信息
     * @return this / option = null return option
     */
    this.option = function(option) {
      if (typeof option != 'undefined') {
        this.opt = option;
        return this;
      } else {
        return this.opt;
      }
    };
  }
  
  module.exports = new xpm();
  