问我可以从模型中清除除某些属性之外的所有属性吗？

EN

clear: function(options) {
  var attrs = {};
  for (var key in this.attributes) attrs[key] = void 0;
  return this.set(attrs, _.extend({}, options, {unset: true}));
},

var myModel = Backbone.Model.extend({
  // You may also override the Backbone clear function
  partialClear: function(options, keep) {
    var attrs = {};
    for (var key in this.attributes) 
      if (!_.contains(keep, key)) attrs[key] = void 0;
    return this.set(attrs, _.extend({}, options, {unset: true}));
  },
});

this.partialClear({}, ['id', 'a', 'b']);