function login() {
    if (jQuery("#ctl00_ContentPlaceHolder1_div_login_sub").css("display") == "none")
        return;
    var userName = jQuery("#txt_userName").val();
    var pwd = jQuery("#txt_pwd").val();

    if (userName == "") {
        alert("请输入用户名！");
        return;
    }
    if (pwd == "") {
        alert("请输入密码！");
        return;
    }
    jQuery("#ctl00_ContentPlaceHolder1_div_login_sub").css("display", "none");
    jQuery("#div_login_submit").css("display", "block");
    jQuery.post("syadmin/operate.aspx", { operateType: "47", userName: userName, pwd: pwd }, function (result) {

        if (result == "1") {
            jQuery("#div_login_submit").css("display", "none");
            jQuery("#ctl00_ContentPlaceHolder1_div_login_sub").css("display", "none");
            jQuery("#ctl00_ContentPlaceHolder1_div_login_in").css("display", "block");
            jQuery("#ctl00_ContentPlaceHolder1_span_userName").text(userName);
        }
        else {
            alert("用户名或密码不正确！");
            jQuery("#ctl00_ContentPlaceHolder1_div_login_sub").css("display", "block");
            jQuery("#ctl00_ContentPlaceHolder1_div_login_in").css("display", "none");
            jQuery("#div_login_submit").css("display", "none");

        }
    })

}


function KeyDown() {
    if (event.keyCode == 13) {
        event.returnValue = false;
        event.cancel = true;
        login();
    }
}

if (document.addEventListener) {

    document.addEventListener("keypress", fireFoxHandler, true);
} else {
    document.attachEvent("onkeypress", ieHandler);
}
function fireFoxHandler(evt) {

    if (evt.keyCode == 13) {
        KeyDown();
    }
}
function ieHandler(evt) {

    if (evt.keyCode == 13) {
        KeyDown();
    }

}