完成登录与注册页面的HTML+CSS+JS，其中的输入项检查包括：
用户名6-12位
首字母不能是数字
只能包含字母和数字
密码6-12位
注册页两次密码是否一致
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" type="text/css" href="../static/css/1234.css">
<script src="../static/js/123.js"></script>
</head>
<body>
<div class="Outbox">
<div class="box">
<h2>欢迎来到博客园，代码改变世界！</h2>
<h3>登录页面</h3>
<div class="input_box">
账号：<input id="umane"type="text"placeholder="请输入账号">
</div>
<div class="input_box">
密码：<input id="upass"type="password"placeholder="请输入密码">
</div>
<div id="error_box"><br></div>
<div class="input_box">
<button onclick="myLogin()">登录</button>
<button onclick=window.alert("请重新输入")>取消</button></div>
</div>
</div>
</body>
</html>
h3{
align:center;
font-family: 楷体;
font-size: large;
}
.Outbox{
display: -webkit-flex;
display: flex;
400px;
height: 250px;
padding-left: 100px;
padding-top: 30px;
background-color:greenyellow;
}
#input_box{
align:center;
margin:500px;
padding-left:500px;
}
#error_box{
color: orangered;
}
body{ padding-right:500px; margin-top:100px; padding-left:500px; font-size:16px; padding-bottom:40px; padding-top:40px; font-family:verdana,Arial,Helvetica,sans-serif; }
function myLogin() {
var oUname = document.getElementById("umane");
var oError = document.getElementById("error_box");
var oUpass = document.getElementById("upass");
oError.innerHTML = "<br>"
//oUname
if (oUname.value.length>12 || oUname.value.length<6){
oError.innerHTML = "用户名必须为6到12位数";
return;
} else if((oUname.value.charCodeAt(0)>=48) && oUname.value.charCodeAt(0)<=57){
oError.innerHTML = "首字母不能为数字";
return;
}else for(var i=0; i<oUname.value.length;i++)
{
if((oUname.value.charCodeAt(i)<48 || oUname.value.charCodeAt(i)>57)&&(oUname.value.charCodeAt(i)<97 || oUname.value.charCodeAt(i)>122 )){
oError.innerHTML = "用户名只能包含字母和数字";
return;
}
}
if(upass.value.length>12 || upass.value.length<6){
oError.innerHTML="密码为6到12位数";
return;
}
window.alert("已成功登陆")
}