Google Analytics（分析）应该放在HTML页面的头部还是底部？ [英] Should Google Analytics go in the head or bottom of an HTML page?
问题描述
Google建议在关闭< / head> 之前放置google analytics脚本。
< script type =text / javascript>
var _gaq = _gaq || [];
_gaq.push（['_ setAccount'，'UA-22180365-1']）;
_gaq.push（['_ setDomainName'，'none']）;
_gaq.push（['_ setAllowLinker'，true]）;
_gaq.push（['_ trackPageview']）;
（function（）{
var ga = document.createElement（'script'）; ga.type ='text / javascript'; ga.async = true;
ga .src =（'https：'== document.location.protocol？'https：// ssl'：'http：// www'）+'.google-analytics.com / ga.js';
var s = document.getElementsByTagName（'script'）[0]; s.parentNode.insertBefore（ga，s）;
}）（）;
< / script>
将< script> 标签放置在< body> 的末尾是可取的，因为 执行它附带的Javascript时的本质。由于用于GA的Javascript是动态插入的，因此是非阻塞的，您可以将它放在任何地方。
我猜Google唯一看到的问题是，在您网站的底部，您可能无法赶上访问者/页面加载完成前取消请求。如果有人打电话给您的HTML文档并取消请求，那么可能不会遇到GA代码（因此不会执行）。
Google advises putting the google analytics script right before closing the </head>.
However, I would prefer to combine it with the rest my javascript that are now all together in a cached, external file, which is loaded at the bottom of my HTML file. Can I do it my way? If so, what am I risking then/what's the cost of putting the below code not in the head but at the bottom of the HTML?
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-22180365-1']);
_gaq.push(['_setDomainName', 'none']);
_gaq.push(['_setAllowLinker', true]);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
You're risking nothing really. Putting <script> tags at the end of the <body> is recommendable because of the blocking nature while executing the Javascript it encloses. Since the Javascript for GA is dynamically inserted and therefore non-blocking, you can put it anywhere.
I guess the only "problem" Google sees is, when putting that code at the bottom of your site, you might not catch visitors / pageloads cancel the request before completed. If someone calls your HTML document and cancels the request, the GA code might not get encountered (and therefore, not executed).
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