<form action=show.php method=post>
<input name=show>
</form>
<SCRIPT LANGUAGE="JavaScript">
document.forms[0].show.value="给定的变量";
document.forms[0].submit();
</SCRIPT>
<input name=show>
</form>
<SCRIPT LANGUAGE="JavaScript">
document.forms[0].show.value="给定的变量";
document.forms[0].submit();
</SCRIPT>
post 是隐式的,而且对长度没有限制.