var SomeModel = Backbone.Model.extend({  validation: {    email: {      required: true,      pattern: 'email',      msg: 'Please enter a valid email'    }  },  validate: function(attr){    console.log(attr);  }});var some = new SomeModel();some.set('email', 'test', {validate: true});console.log(some);能幫忙寫個例子出來嗎？我按照說明寫了個測試，不知道怎么取到錯誤信息呢？