Sencha Touch 本地化存储配置

Ext.define('SenchaTouch.component.Settings', {
    requires : ['Ext.data.Model', 'Ext.ModelManager', 'Ext.data.Store'],

    doDefine : function(key) {
        if (!Ext.ModelManager.isRegistered('Model' + key)) {
            console.log('define model: Model' + key);
            Ext.define('Model' + key, {
                extend : 'Ext.data.Model',
                config : {
                    fields : ['id', 'value'],
                    proxy : {
                        type : 'localstorage',
                        id : 'localSettings-' + key
                    }
                }
            });
        }
    },

    get : function(key) {
        this.doDefine(key);

        var store = Ext.create('Ext.data.Store', {
            model : 'Model' + key
        });

        try {
            store.load();
        } catch(e) {
            return undefined;
        }
        var data = store.getData();
        if (data.items.length > 0) {
            return data.items[0].data.value;
        } else {
            return undefined;
        }
    },
    set : function(key, value) {
        this.doDefine(key);

        var model = Ext.create('Model' + key, {
            id : 1,
            value : value
        });

        model.save();
    },
    remove : function(key) {
        this.doDefine(key);
        var store = Ext.create('Ext.data.Store', {
            model : 'Model' + key
        });

        try {
            store.load();
        } catch(e) {
            console.log('err');
            return undefined;
        }
        var data = store.getData();
        if (data.items.length > 0) {
            data.each(function(record) {
                record.erase();
                record.destroy();
                return true;
            });
        } else {
            return undefined;
        }
    }
});