Susbstore setup on basis of localstorage

ms.bind('ms.page_loaded', function (event) {
    if (ms.substore && ms.substore.alias) {
        localStorage.setItem("substore", ms.substore.alias)
    }
    if (ms.substore || !localStorage.getItem("substore") || !localStorage.getItem("substore").length) {
        return;
    }
    var req = {
        entity: 'ms.settings',
        customCommandName: '',
        data: {
            "store": localStorage.getItem("substore")
        }
    }
    ms.app.call('setPreferences', req, function (err, response) {
        if (!err) location.reload();
    })
})