js/jquery 跨站提交

var _login_lock = 0;
function LoginSubmit() {
var a, actionURL = "http://www.aaa.aaa", loginName = document.getElementById("login_username"), loginPaswd = document.getElementById("login_password");
if (loginName.value == '' || loginName.value == "用户名/E-mail") {
alert('请输入用户名/E-mail'); loginName.focus(); return false
}
else if (loginPaswd.value == '') {
alert('请输入登陆密码'); loginPaswd.focus(); return false
} else {
a = { "username": loginName.value, "password": loginPaswd.value };
if (_login_lock == 0) {
_login_lock = 1;
createFormAndSubmit(a, actionURL, "loginwin", "POST");
}
}
}

if (top != self) top.location = self.location;
function getNewSubmitGetForm(a) { var b = document.createElement("FORM"); document.body.appendChild(b); b.method = a; return b }
function getNewSubmitForm() { var a = document.createElement("FORM"); document.body.appendChild(a); a.method = "POST"; return a }
function createFormAndSubmit(a, b, c, d) { var e = (d == undefined && d == null) ? getNewSubmitForm() : getNewSubmitGetForm(d); for (var f in a) { if (a[f] != "") createNewFormElement(e, f, a[f]) } e.action = b; if (c != undefined && c != null) { e.target = c } e.submit(); return e }
function createNewFormElement(a, b, c) { var d = document.createElement("INPUT"); d.type = "hidden"; d.name = b; a.appendChild(d); d.value = c; return d }

<iframe name="loginwin" id="loginwin" style=" display:none;" ></iframe>

$.ajax({
type: "get",
async: false,
url: "http://aaa.aaa.com?aa=aa",
dataType: "jsonp",
jsonp: "callbackparam",
jsonpCallback: "success_jsonpCallback",
success: function (json) {
var d = eval(json);

},
error: function (e) {
alert(e);
}
});