目前百度索引自动推送的JS代码是这样的，然而它的工作效率非常低，还会给你的网站带来莫名其妙的报错404。性能也比较低下，并且影响你的网站加载速度。
<script>
(function(){
var bp = document.createElement('script');
var curProtocol = window.location.protocol.split(':')[0];
if (curProtocol === 'https') {
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
}
else {
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(bp, s);
})();
</script>于是百度站长社区给出了升级版的代码：
<script>
(function(){
var canonicalURL, curProtocol;
//Get the <link> tag
var x=document.getElementsByTagName("link");
//Find the last canonical URL
if(x.length > 0){
for (i=0;i<x.length;i++){
if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
canonicalURL=x[i].href;
}
}
}
//Get protocol
if (!canonicalURL){
curProtocol = window.location.protocol.split(':')[0];
}
else{
curProtocol = canonicalURL.split(':')[0];
}
//Get current URL if the canonical URL does not exist
if (!canonicalURL) canonicalURL = window.location.href;
//Assign script content. Replace current URL with the canonical URL
!function(){var e=/([http|https]:\/\/[a-zA-Z0-9\_\.]+\.baidu\.com)/gi,r=canonicalURL,t=document.referrer;if(!e.test(r)){var n=(String(curProtocol).toLowerCase() === 'https')?"https://sp0.baidu.com/9_Q4simg2RQJ8t7jm9iCKT-xh_/s.gif":"//api.share.baidu.com/s.gif";t?(n+="?r="+encodeURIComponent(document.referrer),r&&(n+="&l="+r)):r&&(n+="?l="+r);var i=new I*ge;i.src=n}}(window);})();
</script>
