完成登录与注册页面的前端

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

 function fnlogin() {
            var oUname = document.getElementById("uname");
            var oUpass = document.getElementById("upass");
            var oError = document.getElementById("error_box");
            oError.innerHTML = "<br>";
            if (oUname.value.length < 6 || oUname.value.length > 20) {
                oError.innerHTML = "用户名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) {
                    oError.innerHTML = "only letter or number";
                    return;
                }
            }

                if (oUpass.value.length < 6 || oUpass.value.length > 20) {
                    oError.innerHTML = "密码6-20位";

                    return;
                }
                if ((oUname.value.length < 6 || oUname.value.length > 20) && (oUpass.value.length < 6 || oUpass.value.length > 20)) {
                    oError.innerHTML = "用户名或密码位数不合法";

                    return;
                }
                window.alert("登录成功");

        }

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册</title>
<link rel="stylesheet" type="text/css" href="../static/css/zhuce.css">
<script src="../static/jsp/zhuce.js"></script>

</head>
<body>

<div class="box">
<h1>注册</h1>
<div class="input_box">
<input id="name" type="text" placeholder="请输入用户名">
</div>
<div class="input_box">
<input id="phone" type="text" placeholder="手机号">
</div>
<div class="input_box">
<input id="pass" type="password" placeholder="请输入密码">
</div>
<div class="input_box">
<input id="passcom" type="password" placeholder="请再次输入密码">
</div>
<div id="error_box"><br>
</div>
<div class="input_box">
<button onclick="fnLogin()">注册</button>
</div>
</div>

</body>
</html>

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！")
}

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完成登录与注册页面的前端

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