判断是否是微信浏览器，如是A操作，否则B操作

<script type=”text/javascript”>

    window.onload = function () {

        if (!isWeiXin()) {

            window.location.href = “http://www.juevent.com/assets/wcj/paper.pdf”;

        }

    }

    //判断是否是微信浏览器

    function isWeiXin() {

        var ua = window.navigator.userAgent.toLowerCase();

        if (ua.match(/MicroMessenger/i) == ‘micromessenger’) {

            return true;

        } else {

            return false;

        }

    }

</script>