在设置或存储属性的时候进行数据校验

Person = Backbone.Model.extend({
    //如果从validate中返回字符串了，Backbone就会抛个实例异常
    validate: function(attributes) {
        if (attributes.age < 0 && attributes.name != "Dr Manhatten") {
            return '你的存在是个错误';
        }
    },
    initialize: function() {
        console.log('欢迎来到这个报错的世界!');
        this.bind('error', function(model, error) {
            //收到个错误，记录，警告，然后忘记它
            console.log(error);
        });
    }
});

var person = new Person;
person.set({
    name: 'Mary Poppins',
    age: -1
});

//会触发error，输出警告
delete person;

var person = new Person;
person.set({
    name: 'Dr Manhatten',
    age: -1
})