不要这样做

var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?39e8c931d04ef0257bf15eafd3fa4096"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })();