javascript - 事件不起作用？

Question

我正在尝试运行以下代码:

var eligible = Backbone.Model.extend({
        validate : function(attrs,options){
            //alert("ldsafh");
            if(attrs.min < attrs.max) {
                return "not eligible for voting";
            }   
        }

    });

        var age = new eligible({
            advice : "You are "
        });


        age.on("invalid", function(model, error) {
            alert("sfndxgj");
            console.log(model.get('advice') + " " + error);
        });

        age.set({
            min : 18,
            max : 100
        });

为什么这个 age.on 事件不起作用？ 请帮帮我....

Answer 1

将 {validate:true} 作为选项传递给 set。

By default validate is called before save, but can also be called before set if {validate:true} is passed

http://backbonejs.org/#Model-validate

注意:invalid 事件只有在升级到 Backbone 1.0 后才可用。参见 Change log