使用Ajax无刷新页面登录

<script>

window.onload = function () {

var myname = document.getElementById("uname");

var pwd = document.getElementById("pwd");

if (window.XMLHttpRequest) {

var myajax = new XMLHttpRequest();

}

else {

var myajax = new ActiveXObject('Microsoft.XMLHTTP');

}

myajax.open("GET", "login.ashx?name=" + myname .value, true);

myajax.send(null);

myajax.onreadystatechange = function () {

if (myajax.readyState == 4) {

if (myajax.status == 200) {

document.getElementsByTagName("img")[0].src =myajax.responseText;

}

else {

alert("失败");

}

}

}

}

</script>