我这有一个范例：
<HTML>
<HEAD>
<TITLE>
Handling document loading events
</TITLE>
<SCRIPT LANGUAGE="Javascript">
var xmldoc
function loadDocument()
{
xmldoc = new ActiveXObject("microsoft.XMLDOM")
xmldoc.ondataavailable = dataAvailableHandler
xmldoc.onreadystatechange = stateChangeHandler
xmldoc.load('meetings.xml')
}
function dataAvailableHandler()
{
messageDIV.innerHTML += "Status: data available.<BR>"
}
function stateChangeHandler()
{
switch (xmldoc.readyState)
{
case 1:
messageDIV.innerHTML +=
"Status: data uninitialized.<BR>"
break
case 2:
messageDIV.innerHTML += "Status: data loading.<BR>"
break
case 3:
messageDIV.innerHTML += "Status: data loaded.<BR>"
break
case 4:
messageDIV.innerHTML +=
"Status: data loading complete.<BR>"
if(xmldoc.parseErrorCode!=0){
messageDIV.innerHTML +="Status:error.<BR>"
}
else{
messageDIV.innerHTML +=
"Status: data loaded alright.<BR>"
}
break
}
}
</SCRIPT>
</HEAD>
<BODY>
<CENTER>
<H1>
Handling document loading events
</H1>
</CENTER>
<CENTER>
<INPUT TYPE="BUTTON" VALUE="Load the document"
ONCLICK="loadDocument()">
</CENTER>
<DIV ID="messageDIV"></DIV>
</BODY>
</HTML>
运行结果是：
Handling document loading events
Status: data uninitialized.
Status: data loading.
Status: data loaded.
Status: data available.
Status: data loading complete.
Status:error.
但书上说最后一行应该是：
Status: data loaded alright.
请问各位高手这是怎么回事啊？还有它的这几行结果的顺序为什么是这样？
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2004/4/23 16:39:00
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关于载入文档时处理事件的疑问
