Redirect from java script, inside a Json Succces

The method location.href=" link "; or location.href="tupagina.html" serves, we must consider, the following: location.href="Controller / ActionResult";

$.ajax({
                    type: "POST",
                    url: '@Url.Action("IniciarSesion", "Inicio")',
                    content: "application/json; charset=utf-8",
                    dataType: "json",
                    data: { "Usuario": _usuario, "Clave": _clave },
                    success: function (respuesta) {

                        if (respuesta.model == '1') {
                            location.href = "Home/Inicio/";
                        } else if (respuesta.model == '0')
                        {
                            Alert.render('El usuario ingresado no está registrado');
                        } else if (respuesta.model == '2') {
                            Alert.render('La clave ingresada es incorrecta');
                        }
                    },
                    error: function (xhr, textStatus, errorThrown) {
                        Alert.render('Error: No se pudo cargar método "Validar Usuario"');
                    }
                });

What you should do is the following:

Add the following line in the field where you want to redirect:

window.location.href = "urlaredireccionar.html";

You access window and redirect to another window with the desired url.

$.ajax({
    type: "POST",
    url: '@Url.Action("IniciarSesion", "Inicio")',
    content: "application/json; charset=utf-8",
    dataType: "json",
    data: { "Usuario": _usuario, "Clave": _clave },

}).done(function (respuesta){
   if (respuesta.model == '1') {
            //aqui debería redireccionar de alguna manera
            window.location.href = "urlaredireccionar.html";

        } else if (respuesta.model == '0')
        {
            Alert.render('El usuario ingresado no está registrado');

        } else if (respuesta.model == '2') {

            Alert.render('La clave ingresada es incorrecta');
        }
}).fail(function (xhr, textStatus, errorThrown){
    Alert.render('Error: No se pudo cargar método "Validar Usuario"');
});

UPDATE

With the new versions of jQuery some things became obsolete as they are   success, error y complete Now you must use .done, .fail, .always

For now with browsers such as Chrome and Firefox you will not find problems but if you try to execute your code in internet explorer you are more likely to find problems or your script fails and you do not know what happened without seeing the console.

location.href = "https://www.google.com/";

Change google to the page you want to address.

I see that you are not useful location.href try it this way

window.location.replace("http://stackoverflow.com");