度学金要求只能在微信和钱包客户端打开，其他端或浏览器打开需跳转提示页。
js判断端类型
var ua = navigator.userAgent.toLowerCase();
var isweixin = (ua.indexOf("micromessenger") === 0 || ua.indexOf("micromessenger") > 0);
var iswallet = (ua.indexOf("baiduwallet") === 0 || ua.indexOf("baiduwallet") > 0);
if (!(iswallet || isweixin)) {
window.location.href = "/sns/limit";
}
// 优化
var isweixin = (~ua.indexOf("micromessenger"));
var iswallet = (~ua.indexOf("baiduwallet"));
