\u4f5c\u8005blog: www.cnbruce.com\/blog\/ <\/p>\n
AJAX\u7684\u65e0\u5237\u65b0\u673a\u5236\u4f7f\u5f97\u5728\u6ce8\u518c\u7cfb\u7edf\u4e2d\u5bf9\u4e8e\u6ce8\u518c\u540d\u79f0\u7684\u68c0\u6d4b\u80fd\u5373\u65f6\u663e\u793a\u3002<\/p>\n
\u5e38\u89c1\u7684\u7528\u6237\u6ce8\u518c\u662f\u7528\u6237\u8f93\u5165\u7528\u6237\u540d\uff0c\u540e\u53f0\u7a0b\u5e8f\u68c0\u6d4b\u6570\u636e\u5e93\u4e2d\u7528\u6237\u540d\u662f\u5426\u91cd\u590d\u800c\u505a\u51fa\u6ce8\u518c\u7684\u6210\u529f\u4e0e\u5931\u8d25\u4e4b\u63d0\u793a\uff08\u5f53\u7528\u6237\u6ce8\u518c\u91cd\u540d\u65f6\u5c06\u8fd4\u56de\u91cd\u65b0\u6ce8\u518c\uff09\uff0c\u6216\u8005\u7a0d\u5fae\u4eba\u6027\u5316\u4e00\u70b9\u5c31\u662f\u5728\u7528\u6237\u540d\u6587\u672c\u6846\u540e\u6dfb\u52a0\u4e00\u4e2a\u68c0\u6d4b\u6309\u94ae\uff0c\u8ba9\u7528\u6237\u68c0\u6d4b\u540e\u518d\u505a\u6ce8\u518c\u3002<\/p>\n
\u4ee5\u4e0a\u64cd\u4f5c\uff0c\u5bf9\u4e8e\u7528\u6237\u4f53\u9a8c\u65b9\u9762\u6765\u8bf4\u662f\u6bd4\u8f83\u201c\u5dee\u52b2\u201d\u7684\uff0c\u4e00\u4e2a\u5f88\u597d\u7684\u7528\u6237\u4f53\u9a8c\u5c31\u662f\uff1a\u5f53\u7528\u6237\u8f93\u5165\u5b8c\u6ce8\u518c\u7528\u6237\u540d\u540e\uff0cWeb\u7cfb\u7edf\u5e94\u80fd\u5373\u65f6\u68c0\u67e5\u5e76\u5373\u65f6\u663e\u793a\uff0c\u5e76\u5728\u68c0\u67e5\u548c\u663e\u793a\u7684\u540c\u65f6\u4e0d\u5f71\u54cd\u5f53\u524d\u9875\u9762\u7684\u64cd\u4f5c\u3002\u8fd9\u4e5f\u5c31\u662f\u201c\u5f02\u6b65\u83b7\u53d6\u6570\u636e\u201d\u7684\u8981\u6c42\uff0c\u800c\u8fd9\u6b63\u662fAJAX\u7684\u5f3a\u9879<\/p>\n
\u529f\u80fd\u5c55\u73b0 <\/p>\n
\u5f53\u8f93\u5165\u5df2\u7ecf\u5b58\u5728\u7684\u7528\u6237\u540d\uff08\u5982cnbruce\u3001cnrose\uff09\u65f6\u9875\u9762\u5c06\u663e\u793a\u91cd\u540d\u4e0d\u80fd\u6ce8\u518c\uff08false\uff09\uff0c\u5426\u5219\u5c06\u663e\u793a\u53ef\u4ee5\u6ce8\u518c\uff08true\uff09\uff0c\u8fd9\u4e3a\u7528\u6237\u7684\u6ce8\u518c\u63d0\u4f9b\u4e86\u5feb\u901f\u7684\u53c2\u8003\uff0c\u7528\u6237\u4f53\u9a8c\u81f3\u4e0a\u3002<\/p>\n
\u90a3\u4e48\u4e0b\u9762\u5c31\u6765\u8bf4\u8bf4\u662f\u5982\u4f55\u6765\u5b9e\u73b0\u8fd9\u6837\u7684\u529f\u80fd\u7684\u3002<\/p>\n
\u5176\u5b9e\u901a\u8fc7\u5982\u4e0a\u7684t1.htm\u7684\u6e90\u4ee3\u7801\uff0c\u5404\u4f4d\u5c31\u53ef\u4ee5\u770b\u5230AJAX\u7684\u7cbe\u9ad3<\/p>\n
\u9996\u5148\u662f\u5b9a\u4e49XMLHttp\u5bf9\u8c61<\/p>\n
var xmlHttp = false;
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttp = false;
}
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
xmlHttp = new XMLHttpRequest();
}
\u5173\u4e8e\u8fd9\u90e8\u5206\u5185\u5bb9\u7684\u8bf4\u660e \u8bf7\u770b<\/p>\n
\u63a5\u7740\u662f\u81ea\u5b9a\u4e49\u51fd\u6570<\/p>\n
function callServer() {
var u_name = document.getElementById("u_name").value;
if ((u_name == null) || (u_name == "")) return;
var url = "cu.asp?name=" + escape(u_name);
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);
}
\u8be5\u51fd\u6570\u7684\u4e3b\u8981\u529f\u80fd\u5c31\u662f\u5f02\u6b65\u83b7\u5f97cu.asp\u7684\u5185\u5bb9\uff0c\u5728\u6b64\u524d\u5c06\u5148\u63d0\u53d6\u5f53\u524d\u9875\u8868\u5355\u5143\u7d20\u201cu_name\u201d\u5373\u7528\u6237\u540d\u6587\u672c\u6846zhogn \u7684\u503c\uff0c\u901a\u8fc7cu.asp\u5176\u540e\u7684\u53c2\u6570\u53ca\u8d4b\u503c\u800c\u5f97\u5230\u4e86\u4e0d\u540c\u7684\u7ed3\u679c\uff08true or false\uff09\u3002<\/p>\n
\u90a3\u4e48\u8fd9\u91cc\u8981\u8bf4\u7684\u5373\u662fcu.asp\uff0c\u4ed6\u7684\u4e3b\u8981\u529f\u80fd\u5c31\u662f\u63a5\u53d7URL\u53c2\u6570name\u7684\u503c\u505a\u5185\u5bb9\u663e\u793a\uff0c\u8be5\u5185\u5bb9\u6700\u7ec8\u88abt1.htm\u5f02\u6b65\u83b7\u53d6\u3002<\/p>\n
<!–cu.asp\u7684\u6e90\u7801\u793a\u4f8b–><\/p>\n
<!–#include file="conn.asp"–>
<%
name=request.querystring("name")
Set rs = Server.CreateObject ("ADODB.Recordset")
sql = "Select * from u_ser where u_name='"&name&"'"
rs.Open sql,conn,1,1
if rs.eof and rs.bof then
response.write("true")
else
response.write("false")
end if
rs.close
set rs=nothing
call CloseDatabase
%>
\u5982\u4f55\u5c06\u5f02\u6b65\u83b7\u53d6\u7684\u4fe1\u606f\u663e\u793a\u5728\u5f53\u524d\u9875\u5462<\/p>\n
function updatePage() {
if (xmlHttp.readyState < 4) {
test1.innerHTML="loading…";
}
if (xmlHttp.readyState == 4) {
var response = xmlHttp.responseText;
test1.innerHTML=response;
}
}
\u5176\u4e2dxmlHttp.readyState\u4e2d\u7684readyState\u8868\u793a\u670d\u52a1\u5668\u5728\u5904\u7406\u8bf7\u6c42\u65f6\u7684\u8fdb\u5c55\u72b6\u51b5\uff0c\u5176\u503c\u5206\u522b\u67090-4\uff0c\u5404\u6709\u5176\u8bf4\u660e\u60c5\u51b5\uff0c\u5177\u4f53\u8bf7\u53c2\u770b <\/p>\n
\u4f7f\u7528DHTML\u4e2d\u7684innerHTML\u53ef\u663e\u793a\u4fe1\u606f\u5728\u5b9a\u4e49\u7684 <span id="test1">\u662f\u5426\u80fd\u6ce8\u518c<\/span> \u4e0a\u3002<\/p>\n
\u5176\u4f59\u8868\u5355\u9875\u9762\u5c31\u4e0d\u8be6\u53d9\u4e86<\/p>\n