for Extjs4 ,如何正確使用Ext.TaskManager.start & Ext.TaskManager.stop

範例如下:
===================================
var config = {


    msg: 'Display Time',
    modal: true,
    buttons: Ext.Msg.OKCANCEL,
    fn: displayTime
}

Ext.MessageBox.msgButtons[0].setText('Start');
Ext.MessageBox.msgButtons[3].setText('Stop');

Ext.MessageBox.show(config);

function start_task() {
   Ext.MessageBox.updateText('????:' + Ext.util.Format.date(new Date(), 'Y-m-d g:1:s A'));
}

var task = { // moved outside function so it was not called over and over
    run: start_task,
    scope: this,
    interval: 1000
}

function displayTime(id) {
 
    if (id == 'ok') {
       // task was here ... was not always defined due to if statement; was also recalled each time
       Ext.TaskManager.start(task);
    } else {
        Ext.MessageBox.updateText('Paused!');
        Ext.TaskManager.stop(task);
    }
};
============I tried,it works===========================
來源網址在此
大家一起加油吧