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其他特殊的html元素方法：start_html(), end_html(), start_form(), end_form(), start_multipart_form() and all the fill-out form tags。
七 CGI.pm中的form相关
1 start_form 和start_multipart_form
print start_form(-method=>$method,
-action=>$action,
-enctype=>$encoding);
<... various form stuff ...>
print end_form;
-or-
print start_form($method,$action,$encoding);
<... various form stuff ...>
print end_form;
如果没有指定method，action，enctype，默认地为：
method: POST
action: this script
enctype: application/x-www-form-urlencoded for non-XHTML
multipart/form-data for XHTML, see multipart/form-data below.
当使用start_form的时候，enctype为application/x-www-form-urlencoded，如果需要新式的xhtml，则需要使用start_multipart_form,此时enctype为multipart/form-data。
更多内容请参考：cgi man page http://search.cpan.org/~markstos/CGI.pm-3.60/lib/CGI.pm
