js implements login and registration interface
This article mainly introduces the js implementation of the login and registration interface in detail, which has certain reference value. Interested friends can refer to
HTML+CSS+ to complete the login and registration page. JS, the input items checked include:
Username 6-12 digits
The first letter cannot be a number
can only contain letters and numbers
Password 6-12 digits
Whether the two passwords on the registration page are consistent
html code:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>欢迎你，请先登陆！</title> <script type="text/javascript" src="../static/jsp/lx.js"></script> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <link rel="stylesheet" href="../static/css/lx.css"> </head> <body> <p class="box"> <h2>登陆</h2> <p class="input_box"> <input id="uname" type="text" name="user" placeholder="请输入用户名"> </p> <p class="input_box"> <input id="upass" type="password" name="psw" placeholder="请输入密码"> </p> <p id="error_box"><br></p> <p class="input_box"> <button type="button" class="btn btn-primary" onclick="fnLogin()">登陆</button>     <a href="regist.html"><input type="button" class="btn btn-info" name="regist" value="注册"></a> </p> </p> </body> </html>
css code:
*{
margin: 0;
padding: 0;
font-family: 微软雅黑;
font-size: 12px;
}
.box{
width: 390px;
height: 320px;
border: solid 1px #ddd;
background: #FFF;
position: absolute;
left: 50%;
top:42%;
margin-left: -195px;
margin-top: -160px;
text-align: center;
}
.box h2{
font-weight: normal;
color:#666;
font-size: 16px;
line-height: 40px;
overflow: hidden;
text-align: center;
border-bottom: solid 1px #ddd;
background: #f7f7f7;
}
.input_box{
width:350px;
padding-bottom: 15px;
margin: 0 auto;
overflow: hidden;
}javascript code:
function fnLogin() {
var oUname = document.getElementById("uname")
var oUpass = document.getElementById("upass")
var oError = document.getElementById("error_box")
var isError = true;
if (oUname.value.length > 20 || oUname.value.length < 6) {
oError.innerHTML = "用户名请输入6-20位字符";
isError = false;
return;
}else if((oUname.value.charCodeAt(0)>=48) && (oUname.value.charCodeAt(0)<=57)){
oError.innerHTML = "首字符必须为字母";
return;
}else for(var i=0;i<oUname.value.charCodeAt(i);i++){
if((oUname.value.charCodeAt(i)<48)||(oUname.value.charCodeAt(i)>57) && (oUname.value.charCodeAt(i)<97)||(oUname.value.charCodeAt(i)>122)){
oError.innerHTML = "必须为字母跟数字组成";
return;
}
}
if (oUpass.value.length > 20 || oUpass.value.length < 6) {
oError.innerHTML = "密码请输入6-20位字符"
isError = false;
return;
}
window.alert("登录成功")
}Registration interface html code:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>欢迎你，请先登陆！</title> <script type="text/javascript" src="../static/jsp/lx.js"></script> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <p id="container" style="width: 400px" align="center"> <p id="header" style="background-color: aquamarine"> <h2 align="center">注册</h2> </p> <p id="content"> <p align="center">账号: <input id="uname" type="text" name="user" placeholder="账号首字符为字母"> </p> <p align="center">密码: <input id="upass" type="password" name="psw" placeholder="请输入密码"> </p> <p id="error_box"><br></p> <br> <button onclick="fnLogin()" class="btn btn-info">注册</button> </p> <p style="background-color: aquamarine"> <i>版权信息@</i> </p> </p> </body> </html>
The running results are as follows:
Detailed example of js implementation of login and registration interface
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