jquery获取input标签的默认值
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script language="javascript"
src="${pageContext.request.contextPath}/js/jquery-1.4.2.js"></script>
<base href="<%=basePath%>">
<script language="javascript">
$(function() {
$("#only").focus(function() {
if ($(this).val() == $(this)[0].defaultValue) {
$(this).val("");
}
});
$("#only").blur(function() {
if ($.trim($(this).val()) == "") {
$(this).val($(this)[0].defaultValue);
}
});
});
</script>
</head>
<body>
单选框：
<input type="text" id="only" value="用户邮箱/手机号/用户名">
按钮：
<input type="button" id="but" />
</body>
</html>
