Ajax 检验用户唯一性

最新推荐文章于 2018-10-28 19:34:57 发布

cxzhq2002

最新推荐文章于 2018-10-28 19:34:57 发布

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文章标签： ajax xmlhttprequest function input browser html

本文链接：https://blog.youkuaiyun.com/cxzhq2002/article/details/820849

版权

//vu.htm

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>validator user</title>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<script type="text/javascript">
var http_request=false;
function send_request(method,url){
http_request=false;
// inital HttpRequest
if(window.XMLHttpRequest){//Mozilla
http_request = new XMLHttpRequest();
if(http_request.overrideMimeType){//set Mime
http_request.overrideMimeType("text/xml");
}
}
else if(window.ActiveXObject){//IE Browser，use lasted version

var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
for(var n = 0; n < MSXML.length; n ++)
{
try{
http_request = new ActiveXObject(MSXML[n]);
http_request.setRequestHeader('Content-Type', 'text/html; charset=gb2312');//相当于iFrame

break;
}
catch(e){}
}//End IE
}// End inital HttpRequest

if(!http_request){//Error, Creat object fail
window.alert("不能创建XMLHttpRequest对象实例")
return false;
}
http_request.onreadystatechange = processRequest;
//get post or head, and asychFlag??
http_request.open(method, url,true);
http_request.send(null);
}// END send_request()

function processRequest(){
if(http_request.readyState == 4){
if(http_request.status == 200){
document.all["message"].innerHTML= http_request.responseText;}
}
}// End processRequest()

//check.asp

<% response.Charset="GB2312"%>
<%
u_name=request("username")
if u_name="test" then
response.Write(u_name&"已经被注册")
else
response.Write("恭喜，您选的帐号 "&u_name&" 可以注册!")
end if
%>