<!DOCTYPE html><html><head> <title>Ajax</title></head><body> <div id = "new"></div> <script type="text/javascript" src = "scripts/addLoadEvent.js"></script> <script type="text/javascript" src = "scripts/getHTTPObject.js"></script> <script type="text/javascript" src = "scripts/getNewContent.js"></script></body></html>这是书上关于ajax的一个例子，用ctrl+o在chrome浏览器成功运行，关于最后一个getNewContent函数，我想问request.send（null）为什么写在后面？？？
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