smartschool-platform/frontend/pc-web/app/view/basic/student/StudentDetailModel.js

Ext.define('school.view.basic.student.StudentDetailModel', {
    extend: 'school.view.core.form.FormPanelModel',
    alias: 'viewmodel.basic-student-studentdetail',

    formulas: {
        stu_birthday_change: {
            bind: '{stu_birthday}',
            get: function(v) {
                var val = new Date(v);
                var now = new Date();
                var nYear = now.getFullYear();
                var nMonth = now.getMonth() + 1;
                var nDay = now.getDate();

                var vYear = val.getFullYear();
                var vMonth = val.getMonth() + 1;
                var vDay = val.getDate();
                
                var age = 0;

                if(nYear > vYear) {
                    age = nYear - vYear;
                    if((nMonth < vMonth) || (nMonth == vMonth && nDay < vDay)) {
                        age--;
                    }
                }

                this.set('stu_age', age);
                return v;
            }
        }
    }
});