1. t1.html
2. <script language="javascript" type="text/javascript">
3. var xmlHttp = false;
4. try {
5. xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
6. } catch (e) {
7. try {
8. xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
9. } catch (e2) {
10. xmlHttp = false;
11. }
12. }
13. if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
14. xmlHttp = new XMLHttpRequest();
15. }
16. function callServer() {
17. var u_name = document.getElementById("u_name").value;
18. if ((u_name == null) || (u_name == "")) return;
19. var url = "cu.asp?name=" + escape(u_name);
20. xmlHttp.open("GET", url, true);
21. xmlHttp.onreadystatechange = updatePage;
22. xmlHttp.send(null);
23. }
24. function updatePage() {
25. if (xmlHttp.readyState < 4) {
26. test1.innerHTML="loading...";
27. }
28. if (xmlHttp.readyState == 4) {
29. var response = xmlHttp.responseText;
30. test1.innerHTML=response;
31. }
32. }
33. </script>
34. <form name="form1" action="t1.asp" method="post" autocomplete="off">
35. 用户名: <input type="text" name="u_name" id="u_name" onChange="callServer();" />
36. <span id="test1">是否能注册</span><br>
37. 密 码：<input type="password" />
38. <input type="submit" value="注册" />
39. </form>
40. cu.asp
41. <%
42. Response.Buffer = True
43. Response.ExpiresAbsolute = Now() - 1
44. Response.Expires = 0
45. Response.CacheControl = "no-cache"
46. Response.AddHeader "Pragma", "No-Cache"
47. %>
48. <!--#include file="conn.asp"-->
49. <%
50. name=request.querystring("name")
51. Set rs = Server.CreateObject ("ADODB.Recordset")
52. sql = "Select * from u_ser where u_name='"&name"'"
53. rs.Open sql,conn,1,1
54. if rs.eof and rs.bof then
55. response.write("true")
56. else
57. response.write("false")
58. end if
59. rs.close
60. set rs=nothing
61. call CloseDatabase
62. %>

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