JS+AJAX 实现用户登录

<div class="loginbox">

<ul>
<li><input id="gonghao" type="text" class="loginuser" value="21022105"/></li> <!--onclick="JavaScript:this.value=''"-->
<li><input id="mima" type="text" class="loginpwd" value="111111" /></li>
<li>
<input name="" type="button" class="loginbtn" value="登录" onclick="httpRequest()" />
<label><input name="" type="checkbox" value="" checked="checked" />记住密码</label>
<label><a href="#">忘记密码？</a></label></li>
</ul>

</div>

<script language="javascript" type="text/javascript">
function httpRequest() {
var gonghao = document.getElementById("gonghao").value;
var mima = document.getElementById("mima").value;
document.cookie = "gonghao=" + gonghao;
document.cookie = "mima=" + mima;
var xmlHttp;
if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
if (xmlHttp.responseText == "true") {
window.location.assign("../main.html");
} else {
alert('登录失败,用户名或密码不正确!');
}
}
}
xmlHttp.open("get", "LoginHandler.ashx", true);
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");//application/x-www-form-urlencoded text/html; charset=BIG-5
xmlHttp.send();
}

</script>

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
if (context.Request.Cookies["gonghao"] != null&& context.Request.Cookies["gonghao"].Value!="") {
if (context.Request.Cookies["mima"] != null && context.Request.Cookies["mima"].Value != "")
{
string gonghao = context.Request.Cookies["gonghao"].Value;
string mima = context.Request.Cookies["mima"].Value;
//DataTools.SourceName = "E:\\DB\\users.accdb";
string sql = string.Format("select * from Users where 工號='{0}' and 密碼='{1}'", gonghao, mima);
DataTable dt= DataTools.AllData(sql);
if (dt.Rows.Count > 0) {
string xingming = dt.Rows[0]["姓名"].ToString();
HttpCookie cookie = new HttpCookie("xingming", xingming);
context.Response.Cookies.Add(cookie);
context.Response.Write("true");
}
}
}
}

public bool IsReusable
{
get
{
return false;
}
}