在document.write上使用unescape加载javascript有什么好处？

Question

使用Google Analytics分析跟踪网页时必须添加的代码如下所示:

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-XXXXX");
pageTracker._trackPageview();
} catch(err) {}</script>

这些行的优点是什么:

document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

与这些线:

document.write("<script src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'><\/script>");

我写了一些类似的代码(加载javascript"通过"文档写入),但它不使用unescape,我想知道我是否应该遵循谷歌分析示例.

Answer 1

这意味着代码将以XML/XHTML和HTML工作,而不必弄乱CDATA