如何在Model中使用自定义校验

如何在Model中使用自定义校验：

 

Birthday: {
     type: "date",
     validation: {
         custom: function(input) {
             // set the custom message
             input.attr("data-custom-msg", "Birthday cannot be in the future");
 
             if (console != undefined) { console.log(input); }
             var today = new Date();
             return input < today;
         }
     }
 }