24.点击返回上页代码:
<form>
<p><input TYPE="button" ="返回上一步" ="history.back(-1)"></p>
</form>
24.点击刷新代码:
<form>
<p><input TYPE="button" ="刷新按钮一" ="ReloadButton()"></p>
</form>
< language="java"><!--
ReloadButton(){location.href="allbutton.htm";}
// --></>　

24.点击刷新代码2:
<form>
<p><input TYPE="button" ="刷新按钮二" ="history.go(0)"> </p>
</form>　

<form>
<p><input TYPE="button" ="打开一个网站" ="HomeButton()"></p>
</form>
< language="java"><!--
HomeButton(){location.href="http://nettrain.126.com";;;;}
// --></>　

25.弹出警告框代码:
<form>
<p><input TYPE="button" ="弹出警告框" ="AlertButton()"></p>
</form>
<