完成登录与注册页面的前端

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

登录页面代码：

html代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录界面</title>

    <link rel="stylesheet" type="text/css" href="../static/css/deng.css">
    <script src="../static/jsp/deng.js"></script>

</head>
<body>

<div class="box">
    <h1>登录</h1>
    <div class="input_box">
        <input id="name" type="text" placeholder="请输入用户名">
    </div>
    <div class="input_box">
        <input id="pass" type="password" placeholder="请输入密码">
    </div>
    <div id="error_box"><br>
    </div>
    <div class="input_box">
        <button onclick="fnLogin()">登录</button>
    </div>
</div>

</body>
</html>

css代码：

.box {
    border: 1px solid #cccccc;
    position: absolute;
    top: 25px;
    left: 40px;
    float: left;
    height: 300px;
     400px;
}

h1 {
    font-family: 宋体;
    font-size: 28px;
    text-align: center;
    background: #cccccc;
    margin-top: auto;
    height: 40px;
     400px;
}

.input_box {
    height: 60px;
     80px;
    margin-left: 10%;
}

input {
    align-self: center;
    height: 30px;
     300px;

}

button {
    align-content: center;
    font-family: 宋体;
    font-size: 28px;
    text-align: center;
    background: #cccccc;
    height: 40px;
     300px;
}

js代码：

function fnLogin() {
            var oUname = document.getElementById("name");
            var oUpass = document.getElementById("pass");
            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 (oUpass.value.length>20 || oUpass.value.length<6){
                oError.innerHTML = "password:6-20";
                return;

            }
            window.alert("登录成功！")
        }

注册页面：

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/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>

css代码：

.box {
    border: 1px solid #cccccc;
    position: absolute;
    top: 25px;
    left: 40px;
    float: left;
    height: 400px;
     450px;
}

h1 {
    font-family: 宋体;
    font-size: 28px;
    text-align: center;
    background: #cccccc;
    margin-top: auto;
    height: 45px;
     450px;
}

.input_box {
    height: 60px;
     80px;
    margin-left: 12%;
}

input {
    align-self: center;
    height: 30px;
     300px;

}

button {
    align-content: center;
    font-family: 宋体;
    font-size: 28px;
    text-align: center;
    background: #cccccc;
    height: 40px;
     300px;
}
#error_box{
    font-family: 宋体;
    font-size: 15px;
    margin-left: 10%;

}

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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原文地址：https://www.cnblogs.com/cch-1007/p/7763722.html