<form id="pageForm" name="pageForm" method="post"><input name="pageNumber" type="text" id="pageNumber" size="8" onkeydown="if(event.keyCode == 13) pageReturn();"/><input name="btnReturn" type="button" id="btnReturn" value="转到" onclick="pageReturn();"/></form><script language="javascript">function pageReturn() {if (pageForm.pageNumber.value == "") {alert("请输入页号");return;}window.open("index.asp?page=" + pageForm.pageNumber.value, "_self") ;}</script> 
