code: function warnEventListenMethod(eventBind, owner) {
      var valid = true;
      var method = owner;
      each(eventBind.expr.name.paths, function (path) {
          method = method[path.value];
          valid = !!method;
          return valid;
      });
  
      if (!valid) {
          var paths = [];
          each(eventBind.expr.name.paths, function (path) {
              paths.push(path.value);
          });
  
          warn(eventBind.name + ' listen fail,"' + paths.join('.') + '" not exist');
      }
  }
docs: #[begin] error 
  事件绑定不存在的 warning
  
  @param {Object} eventBind 事件绑定对象
  @param {Component} owner 所属的组件对象