在document.write上使用unescape来加载javascript有什么好处？ [英] What is the advantage of using unescape on document.write to load javascript?

问题描述

 < script type =>您必须添加的代码才能用Google Analytics分析网页。 文本/ JavaScript的 > 
 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> 
尝试{
 var pageTracker = _gat._getTracker（UA-XXXXX）; 
 pageTracker._trackPageview（）; 
} catch（err）{}< / script> 
  

做这些行的优点是：

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

与这些行相比：

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

我编写了一些类似的代码（通过document write加载JavaScript），但它不使用unescape，我想知道是否应该遵循google-analytics的例子。 解决方案

这意味着代码将在XML / XHTML和HTML，而不必混淆CDATA

The code that you have to add to track a web page with google analytics looks like:

<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>

What's the advantage of doing these line:

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

versus these line:

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

I wrote some code that does something similar (load javascript "via" document write) but it does not use unescape and I am wondering if I should follow the google-analytics example.

解决方案

It means the code will work in XML / XHTML and HTML without having to mess with CDATA

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