$(‘#person_name,#person_password,#person_captcha‘).focus(function () {
$("#errorMsg").slideUp();
});
<div class="error_show" id="errorMsg"> <c:if test="${not empty message}"><script>document.getElementById("errorMsg").style.display = "block";;</script>${message}</c:if> </div>
原文：http://www.cnblogs.com/james-roger/p/5354771.html