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
登录页面：
1.html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登录</title>
<link href="../static/css/wow.css" rel="stylesheet" type="text/css">
<script src="../static/js/wow.js"></script>
</head>
<body class="bg">
<div id="container">
<div class="box">
<h2 id="denglu">登录</h2>
<div class="input_box">
<input type="text" id="uname" placeholder="请输入用户名">
</div>
<div class="input_box">
<input type="password" id="upass" placeholder="请输入密码">
</div>
<div class="error" id="error_box"><br></div>
<div class="input_box">
<button id="login" type="submit" onclick="fnLogin()">登录</button>
<button id="cancel" type="cancel" onclick="fnLogin()">取消</button>
</div>
</div>
</body>
</html>
2.js代码
function fnLogin() {
var oUname = document.getElementById("uname");
var oUpass = document.getElementById("upass");
var oError = document.getElementById("error_box");
oError.innerHTML = "<br>"
// uname
if (oUname.value.length > 20 || oUname.value.length < 6) {
oError.innerHTML = "亲，用户名至少6-20位哦";
return;
} else if ((oUname.value.charCodeAt(0) >= 48) && (oUname.value.charCodeAt(0) <= 57)) {
oError.innerHTML = "用户名首字母不能是数字";
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 = "用户名只能为字母或数字";
return;
}
}
// upass
if (oUpass.value.length > 20 || oUpass.value.length < 6) {
oError.innerHTML = "亲，密码至少6-20位哦";
return;
}
window.alert("用户登录成功！")
}
3.css代码
*{
margin: 0;
padding: 0;
font-family:"华文新魏";
font-size: 12px;
}
.bg {
background-image: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1509547320024&di=5e67e4bd86013c364815958d31c9766d&imgtype=0&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F01a7cf554bfe79000001bf7250f6c3.jpg%402o.jpg);
background-repeat: no-repeat;
background-size: 100%;
}
.box {
border: 1px solid #cccccc;
position: absolute;
top: 42%;
left: 50%;
height: 320px;
width: 390px;
background: #FFF;
margin-left: -195px;
margin-top: -160px;
}
h2 {
font-size: 16px;
text-align: center;
height: 46px;
font-weight:normal;
color:#666;
line-height: 46px;
backgroud:#f7f7f7;
overflow: hidden;
border-bottom:solid 1px #ddd;
}
#denglu{
font-size: 35px;
}
#uname{
font-size: 20px;
}
#upass{
font-size: 20px;
}
.input_box {
width: 350px;
padding-bottom: 15px;
margin:0 auto;
overflow:hidden;
}
input {
align-self: center;
height: 31px;
width: 280px;
}
button {
align-content: center;
font-family: 华文新魏;
font-size: 31px;
text-align: center;
background: #cccccc;
height: 40px;
width: 300px;
}
#error_box{
font-family: "华文楷体";
font-size: 29px;
}
登录页面如图：
注册页面：
1.html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册</title>
<link rel="stylesheet" type="text/css" href="../static/css/wow.css">
<script src="../static/jsp/wow.js"></script>
</head>
<body><body class="bg">
<div id="container">
<div class="box">
<h2 id="zhuce">注册</h2>
<div class="input_box">
<input type="text" id="uname" placeholder="请输入用户名">
</div>
<div class="input_box">
<input type="phone" id="phone" type="text" placeholder="手机号">
</div>
<div class="input_box">
<input type="password" id="pass" placeholder="请输入密码">
</div>
<div class="input_box">
<input type="password" id="password" placeholder="请再次输入密码">
</div>
<<div class="error" id="error_box"><br></div>
<div class="input_box">
<button id="register" onclick="fnLogin()">注册</button>
</div>
</div>
</body>
</html>
2.js代码
function fnLogin() {
var oUname = document.getElementById("name");
var oUphone = document.getElementById("phone");
var oUpass = document.getElementById("pass");
var oUpasscom = document.getElementById("passcom");
var oError = document.getElementById("error_box");
var isError = true;
oError.innerHTML = '<br>';
//
if (oUname.value.length > 20 || oUname.value.length < 6) {
oError.innerHTML = "name:6-20位";
isError = false;
return;
} else if ((oUname.value.charCodeAt(0) >= 48) && (oUname.value.charCodeAt(0) <= 57)) {
oError.innerHTML = "first letter.";
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(0) < 97) || (oUname.value.charCodeAt(0) > 122)) {
oError.innerHTML = "only letter or number";
return;
}
}
if (oUphone.value.length != 11) {
oError.innerHTML = "error phone";
return;
}
if (oUpass.value.length > 20 || oUpass.value.length < 6) {
oError.innerHTML = "password:6-20";
return;
}
if (oUpass.value != oUpasscom.value) {
oError.innerHTML = "sorry,the password is false";
return
}
window.alert("注册成功！")
}
注册页面如图：
