实现代码一：

给标签内属性值加上双引号

var addDqmForPP = function(shtml){ return shtml.replace(/( [^\=]*\=)(\s?[^\"\s\>]*)/ig,function(a,b,c,d,e){return (c)?(new RegExp("<[^>]*"+c.replace(/(\^|\(|\)|\[|\]|\{|\}|\?|\-|\\|\/|\||\$)/g,'\\$1')+"[^>]*>","i").test(e))?b+'"'+c+'"':b+c:b});};

完整测试代码

<textarea id="t" style="height:200px; width:300px;"><UL class=list><LI class=feed_item><SPAN class=note>01/12/2008</SPAN><P><A title=GE公司推出“汪力和李邦”网络广告 href=http:///content/Detail.asp?ReleaseID=4879&amp;NewsAreaID=2&amp;changeCurrentLocale=5" _eventID="5">GE石油天然气集团在中国创造新的快速安装记录</A></P></LI></UL></textarea><script type="text/javascript">var partialXHTML = function (value) { return value.replace(/<(\/?[a-zA-Z]+\s*)((?:"[^"]*"|'[^']*'|(?!'|"|\/?>).)*)(\/?>)/g, function (l, $1, $2, $3) { return '<' + $1.toLowerCase() + $2.replace(/([^=]+)=(?:(")[^"]*"|(')[^']*'|((?:(?!\s|'|"|\/?>).)*))/g, function (l, $1, $2, $3, $4) { return ($2||$3) ? l : $1 + '="' + $4 + '"'; }) + $3; });};var parse = function (t) { t.value = partialXHTML(t.value);};</script><input type="button" value="修正" onclick="parse(document.getElementsByTagName('textarea')[0])" />