var str = "<span class=\"style25\">好车,新车,二手车,不错的车子</span>";
var keyWord = "二手车";
str = str.replace(new RegExp("("+keyWord+")","gi"),"<a href=http://cdb.chinacars.com target=\"_blank\">$1</span>");
alert(str)
var keyWord = "二手车";
str = str.replace(new RegExp("("+keyWord+")","gi"),"<a href=http://cdb.chinacars.com target=\"_blank\">$1</span>");
alert(str)
var reg = /<span[^>]*>[^<]+<\/span>/ig;
var key = "二手车";
string = string.replace(reg, function() {
return arguments[0].replace(new RegExp(key, "i"), "<a href=\"http://cdb.chinacars.com/\" target=\"_blank\">" + key + "</a>")
});
<script type="text/javascript">
//<![CDATA[
onload=function(){
test('span', '二手车');
}
function test(tag, flag){
var o=document.getElementsByTagName(tag)
for(var i=0; i<o.length; i++){
if(o[i].firstChild.data.indexOf(flag)>-1){
o[i].innerHTML='<a href=http://cdb.chinacars.com target="_blank">'+flag+'</span>'
}
}
}
//]]>
</script>
<span class="style25">好车,新车,二手车,不错的车子</span>
<span class="style25">新车,二手车,不错的车子</span>
<span class="style25">二手车,不错的车子</span>
<span class="style25">不错的车子</span>