符合屏蔽地区就跳转

<script type="text/javascript" src="http://pv.sohu.com/cityjson"></script>
<script type="text/javascript">
    //获取值
    var ipinfo = returnCitySN ["cname"];
    console.log(ipinfo);
    //判断条件开始
    if (ipinfo.toString().indexOf("成都") != -1) {
        window.location.href = "/404.html";
        //符合屏蔽地区就跳转
    } else {
        //否则就看你自己定义了
    }
</script>