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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <script> function ok(){ var oldpass = document.getElementById('passold'); var newpass = document.getElementById('passnew'); if(oldpass.value.length< 1|| newpass.value.length < 1){ alert('不能为空'); return false; }else if(oldpass.value!=newpass.value){ alert("输入不一致"); return false; }else{ alert('修改成功'); return true; } } </script> </HEAD> <BODY> <INPUT TYPE="text" NAME="passold" value="" id="passold"> <INPUT TYPE="text" NAME="passnew" value="" id="passnew"> <INPUT TYPE="button" value="提交" onclick="ok()"> </BODY> </HTML>