js修改html内容

<script type="text/javascript">
function changeText(){
document.getElementById('boldStuff').innerHTML = 'Fred Flinstone';
}
</script>
<p>Welcome to the site <b id='boldStuff'>dude</b> </p> 
<input type='button' onclick='changeText()' value='Change Text'/>

<script>
function tttd(s,n,m){
        //$('#aaaa'+n).text(s);
        document.getElementById('aaaa'+n).innerHTML = s;
}
function tttdd(s,n,m){document.getElementById('aaaa'+n).innerHTML = m;
        //$('#aaaa'+n).text(m);
}
</script>