ajax 异步获取数据实现代码 （js创建ajax对象）
- 作者: 星辰之怒55139316
- 来源: 51数据库
- 2021-08-22
复制代码 代码如下:
<script type="text/javascript"><!--
var request = false;
try {
request = new xmlhttprequest();
} catch (trymicrosoft) {
try {
request = new activexobject("msxml2.xmlhttp");
} catch (othermicrosoft) {
try {
request = new activexobject("microsoft.xmlhttp");
} catch (failed) {
request = false;
}
}
}
if (!request) alert("error initializing xmlhttprequest!");
//获取信息
function getinfo() {
var url = "test.aspx?username=" + document.getelementbyid("txtname").value;
request.open("get", url, true);
request.onreadystatechange = updatepagetime;
request.send(null);
}
//更新页面
function updatepagetime() {
if (request.readystate == 4) {
if (request.status == 200) {
var response = request.responsetext;
document.getelementbyid("txtloginname").value = response;
} else if (request.status == 404) {
alert("requested url is not found.");
} else if (request.status == 403) {
alert("access denied.");
} else
alert("status is " + request.status);
}
}
// --></script>
<form id="form1" runat="server">
<input id="txtname" onchange="getinfo()" type="text" />
<input id="txtloginname" type="text" />
</form>
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