关于Javascript 问题

smallpig

有一段javacript如下， 有人知道为何javacript 1.2为何 要另外加一段代码处理吗？？谢谢

1. 
   
2. <script language="Javascript" type="text/javascript"><!-- gVersion="1.0"; //-->
   
3. </script>
   
4. <script language="Javascript1.1" type="text/javascript"><!-- gVersion="1.1"; //-->
   
5. </script>
   
6. <script language="Javascript1.2" type="text/javascript"><!-- gVersion="1.2"; var RE={"%09":/\t/g,"%20":/ /g,"%23":/\#/g,"%26":/\&/g,"%2B":/\+/g,"%3F":/\?/g,"%5C":/\\/g}; //-->
   
7. </script>
   
8. <script language="Javascript1.3" type="text/javascript"><!-- gVersion="1.3"; //-->
   
9. </script>
   
10. <script language="Javascript1.4" type="text/javascript"><!-- gVersion="1.4"; //-->
    
11. </script>
    
12. <script language="Javascript1.5" type="text/javascript"><!-- gVersion="1.5"; //-->
    
13. </script>
    
14. <noscript>
    
15. <img name="dcsimg" width="1" height="1" alt=" " src="http://www1.member-hsbc-group.com/insert_own_entity_dcs_id_here/njs.gif?dcsuri=/nojavascript&WT.js=No" />
    
16. </noscript>

复制代码

iptton

没有上下文...RE这个变量是做什么的？
是从什么库里摘出来的？

smallpig

RE 这个可以看成是正则表达式，负责修改有问题的参数


Regular expression list used to URL encode query parameter values


URL Encoding
Certain characters can cause problems when used in query parameter values.
For example, for a WebTrends query parameter assignment of WT.ti="The Gettysburg Address"; SDC writes the following value to the log file:

&WT.ti=The Gettysburg Address

The space characters in this value cause problems because the space character is used to separate fields within a log file.
The solution is to URL encode all query parameter values.

URL encoding means replacing certain characters with their hexadecimal equivalents of the form %XX where % is the escaping character and XX is the character’s numeric ASCII value.

URL encoded characters are properly rendered in WebTrends reports.

Continuing with this example, the URL-encoded form is as follows:

&WT.ti=The%20Gettysburg%20Address

Note that space characters have been replaced by %20.

The tag URL encodes the following characters: tab, space, #, &, +, ?, ", \, and non-breaking spaces.
These characters are defined in the regular expression list.
The regular expression list contains regular expressions to search for, and the corresponding %XX replacement strings.

Regular expression properties are used as arguments to the string.replace method.

The tag URL encodes parameter values by passing them as arguments into the dcsEscape function.

[ 本帖最后由 smallpig 于 2008-1-25 01:12 编辑 ]

smallpig

或许我这样问一下，  javacript 1.2  和其他版本之间有什么主要区别吗？？ 或者 javacript 1.2 有什么主要缺点？？

iptton

没留意过这方面 的东西..
基本上都是用1.5了...
就像不大必要考虑IE5及其以下版本一样..

不过也想知道这方面的知识，期待有人回答..

iptton

RE是一个JSON OBJECT吧,要看应用才能知道 1.2在这方面的缺点是什么..