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

登录界面
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>江南皮革厂</title>
    <link rel="stylesheet" type="text/css" href="./static/shabi/denglukuang.css">
    <script>
        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 = "用户名要6-20位";
                return;
            }else if((oUname.value.charCodeAt(0)>=48)&&(oUname.value.charCodeAt(0)<=57)){
                oError.innerHTML = "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 = "只能包含字母和数字";
            }
            if(oUpass.value.length<6 || oUpass.value.length>20){
                oError.innerHTML = "密码要6-20位"
            }
            if((oUname.value.length<6 || oUname.value.length>20) && (oUpass.value.length<6 || oUpass.value.length>20)){
                oError.innerHTML = "用户名和密码都要6-20位"
            }
        }
    </script>
</head>
<body>
<hr>
<div class="bigdiv">
    <div><h3>登录</h3></div>
    <div>
            用户:<input id="uname" type="text"  placeholder="用户名">
    </div>
    <div>
            密码:<input id="upass" type="password"  placeholder="密码"><br>
    </div>
    <div id="error_box"><br></div>
    <div>
        <button class="button" onclick="fnLogin()">登录</button>
        <button class="button">注册</button>
    </div>
    <div><h6>版权归江南皮革厂所有</h6></div>
    <p>如有疑问可联系小梁：13711269544</p>
</div>

</body>
</html>
注册界面
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>江南皮革厂</title>
    <link rel="stylesheet" type="text/css" href="./static/shabi/denglukuang.css">
    <script>
        function fnLogin(){
            var oUname=document.getElementById("uname");
            var oUpass=document.getElementById("upass");
            var oUpass=document.getElementById("upasss");
            var oError=document.getElementById("error_box");
            oError.innerHTML="<br>"
            if(oUname.value.length<6 || oUname.value.length>20){
                oError.innerHTML = "用户名要6-20位";
                return;
            }else if((oUname.value.charCodeAt(0)>=48)&&(oUname.value.charCodeAt(0)<=57)){
                oError.innerHTML = "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 = "只能包含字母和数字";
            }
            if(oUpass.value.length<6 || oUpass.value.length>20){
                oError.innerHTML = "密码要6-20位";
                return;
            }
            if((oUname.value.length<6 || oUname.value.length>20) && (oUpass.value.length<6 || oUpass.value.length>20)){
                oError.innerHTML = "用户名和密码都要6-20位";
                return;
            }
            if(upass!=upasss){
                document.getElementById("error_box").innerHTML="两次密码不一致";
                return;
            }
        }
    </script>
</head>
<body>
<hr>
<div class="bigdiv">
    <div><h3>新用户</h3></div>
    <div>
            用户:<input id="uname" type="text"  placeholder="用户名">
    </div>
    <div>
            密码:<input id="upass" type="password"  placeholder="密码"><br>
    </div>
    <div>
            密码:<input id="upasss" type="password"  placeholder="再次输入密码"><br>
    </div>
    <div id="error_box"><br></div>
    <div>
        <button class="button" onclick="fnLogin()">注册</button>
    </div>
    <div><h6>版权归江南皮革厂所有</h6></div>
    <p>如有疑问可联系小梁：13711269544</p>
</div>

</body>
</html>
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原文地址：https://www.cnblogs.com/951111ldj/p/7768171.html