code: function(str){
      var match = str.split(':');
  
      var module_id = match[0];
      var module_instance = match[1];
  
      var instance = [];
  
      if(this.sid && this.options.instance_through) instance.push(this.sid);
      if(this.instance && this.options.instance_through) instance.push(this.instance);
      if(module_instance) instance.push(module_instance);
  
      var info = {
        filename: mid.path(module_id, this.options),
        instance: instance.join('-')
      };
  
      return info;
    }
docs: 从字符串中解析id, instance