sencha touch ajax 自动提示消息 masked

搬运，备忘

1                 Ext.Ajax.on('beforerequest', function (connection, options) {
2                 });
3                 Ext.Ajax.on('requestcomplete', function (connection, options) {
4                 });
5                 Ext.Ajax.on('requestexception', function (connection, options) {
6                 });