<script type="text/javascript">
        
        var str = 'bbabadfadg<BR><IMG SRC="IMAGES/xxxx.jgp"><A HREF="FILE/help.html">help</A><P>AAAAA</P><SPAN>00000</SPAN>';
      
        var reg= /[^=<>]+(?=\=)/;
        str = str.replace(/<[^>]+?>/g, function (s) { 
            if (reg.test(s)) { 
                return reg.exec(s).toLowerCase();
            }
            else return s.toLowerCase();
        });
        alert(str);
    </script>

------解决方案--------------------
JScript code

var str = "bbabadfadg<BR><IMG SRC=\"images/xxxx.jgp\"><A HREF=\"file/help.html\">help</A><P>AAAAA</P><SPAN>00000</SPAN>";
    str = str.toLowerCase();
    var r = /<[\/]*(a|span).*?>/g;
    var s = str.match(r);
    
    str = str.replace(r,"");

------解决方案--------------------
JScript code

var r = /<[\/]*(a|span).*?\/(a|span)?>/g;

------解决方案--------------------
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高人啊,如果需要把属性的值也转成小写,怎么改??谢谢