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      httpRequest = createHttpRequest();
      httpRequest.onreadystatechange = aa;
      httpRequest.open("GET",url,true);
      httpRequest.send(null);
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var httpRequest = false;
var mesdivs = null
function sendRequest(url, mesdiv) {
 
    mesdivs = mesdiv;
    httpRequest = false;
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
......

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jQuery Ajax ʵÀýÑÝʾ

<
script language=
"javascript"
>
 
$(
document)
.ready
(
function
(
)
{
$(
'#send_ajax'
)
.click
(
function
(
)
{
var
params=
$(
'input'
)
.serialize
(
)
;
//ÐòÁл¯±íµ¥µÄÖµ
$.ajax
(
{
url:
'ajax_json.php'
,
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