跨域访问，跨域调用窗口

目的在与调用不同（子）域名的通用登录窗口，并实现跨域操作
##########主页#######################

var getHost = function () {
        var host = "null";
        var url = window.location.href;
        var regex = /.*://([^/|:]*).*/;
        var match = url.match(regex);
        if (typeof match != "undefined"
            && null != match) {
            host = match[1];
        }
        if (typeof host != "undefined"
            && null != host) {
            var strAry = host.split(".");
            if (strAry.length > 1) {
                host = strAry[strAry.length - 2] + "." + strAry[strAry.length - 1];
            }
        }
        return host;// host格式 '.xxxx.com'
    }

    function IsTestUrl(documentStr) {
        var v_domain = documentStr;
        if (/tgxrc|localhost|d:/gi.test(v_domain)) {//是否本地测试域名
           return ".txxxx.com";
        }
        else
            return ".xxxx.com";
    }
   
    function loginForm() {
        layer.closeAll();
        document.domain = getHost();
        layer.open({
            type: 2,
            shade: 0.3,
            shadeClose: true,
            fix: false,
            title: "企业登录",
            area: ['600px', '380px'],
            content: "http://pass" + IsTestUrl(document.domain) + "/vip/login", //登录页面地址 调用其他域名的登录地址
            close: function (index) {
                
                layer.close(index);
            }
        });
    }
    function loginLayerOp() {
        layer.closeAll();
        showThisForm();
    }
  

    var c_cna_Sel_pk = true;

    function showThisForm() {
        document.domain = "share" + IsTestUrl(document.domain);
        layer.open({
            type: 2,
            shade: 0.3,
            fix: false,
            title: false,
            shadeClose: true,
            area: ['600px', '450px'],
            content: '/Subject2017/MiddleSenior/PartialShowInfo',
            close: function (index) {
                layer.close(index);
            }
        });
    }

################局部视图页##################

<script type="text/javascript">
var v_domain = document.domain;
if (/txxxx|localhost|d:/gi.test(v_domain)) {//是否本地测试域名
v_domain = ".txxxx.com";
}
else
v_domain = ".xxxx.com";

function loginLayerOp(index) {

layer.closeAll();
}
$("#sureLoginBtn").click(function () {
document.domain = "share" + v_domain;
// layer.closeAll();
parent.loginForm();
});
</script>

需要重新 将document.domain 设置回主页所在域名。否则parent将不可用