jquery表单验证

引入：注意js.jar版本<script type="text/javascript"src="${pageContext.request.contextPath}/js/jquery-1.8.3.js"></script>js判断<script type="text/javascript">$(function() {$("#btn1").click(function() {//检验用户名var na = $("#username").val();if (na == "") {alert("用户名不能为空");na.focus();return false;}//检验密码var pass = $("#password").val();if (pass == "" || pass.length < 6) {alert("密码不能小于6位！");pass.focus();return false;}//真实姓名var trurname = $("#truename").val();if (truename == '') {alert("姓名不能为空");truename.focus();return false;}//验证码var cc = $("input[name='code']").val();if (cc == '') {alert("验证码不能为空");cc.focus();return false;}$("form").submit();});});</script>