<Js>修改样式

document.getElementById("ao"+"\n").style.color="green";

document.getElementById("ao"+"\n").style.fontsize="50px";

document.getElementById("ao"+"\n").style.width="20px";

点击修改:
<h1 id="ao">什么？</h1>
<input type="button" value="请点击" onclock="document.getElementById("ao").style.width="20px""  />

隐藏和显示：
<input type="button" value="隐藏文本" onclick="document.getElementById('p1').style.visibility='hidden'" />
<input type="button" value="显示文本" onclick="document.getElementById('p1').style.visibility='visible'" />