js实验——用户名，密码验证
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form>
<span>用户名</span>
<input type = "text" id = "user">
<input type = "submit" value = "用户名验证" onclick = "checkUser()"><br><br/>
</form>
<form>
<span>密码</span>
<input type = "password" id = "password">
<input type = "submit" value = "密码验证" onclick = "checkPassword()">
</form>
<script>
function checkUser()
{
var checkText = document.getElementById("user").value;
var reg = /[a-zA-Z0-9]{6}/;
var boo = reg.test(checkText);
if(boo)
alert("格式正确");
else
alert("格式错误");
}
function checkPassword()
{
var checkText1 = document.getElementById("password").value;
var reg = /[a-zA-Z0-9]{6}/;
var boo = reg.test(checkText1);
if(boo)
alert("格式正确");
else
alert("格式错误");
}
</script>
</body>
</html>
正则式替换符号
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<script language="JavaScript">
//"\\d",/\d+/g用于查找数字字符
var regExp = new RegExp("\\d+","g");
var str = "123abc345de434fg";
document.write(str.replace(regExp,"#"));
document.write("<br>");
document.write(str.replace(/\d+/g,"#"));
</script>
</body>
</html>
