爪哇豆的秘密( JAVA FLEX MAC IPHONE IPAD )

now ,I will show you the AJAX  basic flow map.

1. Whether the  XMLHttpRequest object create 
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2.  open  method (the POST and the GET, the URL, same period or the  asynchronism which is requested and so on appointment)
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3. send method (data transmission)
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                               < Server side >
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4. the  onreadystatechange event (other than the ie the call-back also the  onload can use (sending and receiving state changes, the  event which is started)
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5. the readyState property (the value which displays sending and receiving state, with 4 completion of reception.  If onload unnecessary. 
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6. responseText or responsecXml property (reception data)