H5+css3+js搭建带验证码的登录页面

(编辑：jimmy 日期: 2024/10/30 浏览：2)
本文实例为大家分享了H5+css3+js搭建带验证码的登录页面，供大家参考，具体内容如下
<!DOCTYPE HTML>
<html>
 <head>
 <title>EasyBuy后台管理系统</title>
 <meta charset="utf-8">
 <style>
 .main_bar{
 width:1350px;
 height:350px;
 background-color:#6495ED;
 margin-top:10%;
 } 
 #login_form{
 width:40%;
 height:100%;
 background-color:#112435;
 margin:0 auto;
 }
 .title{
 width:100%;
 height:55px;
 color:#ffffff;
 border-bottom:1px solid #ffffff;
 font-size:20pt;
 font-family:"微软雅黑";
 line-height:55px;
 text-align:center; 
 }
 #form_widget{
 width:100%;
 height:295px;
 background-color:#808080;
 }
 .txt{
 display:block;/*设置为独立块（换行）*/
 width:70%;
 margin:0 auto;
 height:35px;
 font-size:15pt;
 border-radius:5px;/*设置圆角样式*/
 border:0;
 padding-left:8px;
 }
 #vcode{
 height:35px;
 width:40%;
 font-size:15pt;
 margin-left:15%;
 border-radius:5px;
 border:0;
 padding-left:8px;
 }
 #code{
 color:#ffffff;/*字体颜色白色*/
 background-color:#000000; 
 font-size:20pt;
 font-family:"华康娃娃体W5";
 padding:5px 35px 10px 35px;
 margin-left:5%; 
 cursor:pointer;
 }
 #search_pass_link{
 width:70%;
 text-align:right;
 margin:0 auto;
 padding:5px;
 }
 /*层级选择器*/
 #search_pass_link a{
 color:#000000;
 text-decoration:none; 
 }
 /*伪类*/
 #search_pass_link a:hover{
 color:#ff0000;
 text-decoration:underline;
 }
 .btn{
 width:70%;
 margin-left:15%;
 height:40px;
 border:0;
 font-size:14pt;
 font-family;"微软雅黑";
 background-color:#FC5628;
 color:#ffffff;
 cursor:pointer;/*设置指针鼠标的样式*/
 border-radius:20px;/*设置圆角样式*/
 border:0;
 } 
 #copyright{
 width:100%;
 text-align:center;
 padding-top:20px;
 font-family:"微软雅黑";
 color:#e0e0e0;
 }
 </style>
 </head>
 <body leftmargin="0" οnlοad="changeImg()">
 <div class="main_bar"> 
 <div id="login_form">
 <div class="title">
  EasyBuy系统登录  
 </div> 
 <form action="main.html" οnsubmit="return check()">
 <div id="form_widget">
  <br>
  <input type="text" placeholder="请输入账号" id="box_name" class="txt" value="用户名" οnfοcus="this.value=''" οnblur="if(this.value=='')this.value='用户名'"/>
  <br>
  <input type="password" placeholder="请输入密码" id="box_pass" class="txt" value="password" οnfοcus="this.value=''" οnblur="if(this.value=='')this.value='password'"/>
  <br>
  <input type="text" id="vcode" placeholder="验证码" value="验证码" οnfοcus="this.value=''" οnblur="if(this.value=='')this.value='验证码'"/><span id="code" title="看不清，换一张"></span>
  <div id="search_pass_link">
  <a href="#" rel="external nofollow" >忘记密码？</a>
  </div>  
  <input type="submit" value="登录" class="btn" οnmοuseοver="this.style.backgroundColor='#FF8D00'" οnmοuseοut="this.style.backgroundColor='#FC5628'">
  <br>
  <div id="copyright">
  Power By WXH &copy;CopyRight 2016
  </div>
 </div>
 </form>
 </div>
 </div> 
 </body> 
 <script type="text/javascript">
 var code;//声明一个变量用于存储生成的验证码
 document.getElementById("code").οnclick=changeImg;
 function changeImg(){
 //alert("换图片");
 var arrays=new Array(
 '1','2','3','4','5','6','7','8','9','0',
 'a','b','c','d','e','f','g','h','i','j',
 'k','l','m','n','o','p','q','r','s','t',
 'u','v','w','x','y','z',
 'A','B','C','D','E','F','G','H','I','J',
 'K','L','M','N','O','P','Q','R','S','T',
 'U','V','W','X','Y','Z' 
 );
 code='';//重新初始化验证码
 //alert(arrays.length);
 //随机从数组中获取四个元素组成验证码
 for(var i=0;i<4;i++){
 //随机获取一个数组的下标
 var r=parseInt(Math.random()*arrays.length);
 code+=arrays[r];
 //alert(arrays[r]);
 }
 //alert(code);
 document.getElementById('code').innerHTML=code;//将验证码写入指定区域
 } 
 
 //效验验证码(表单被提交时触发)
 function check(){
 //获取用户输入的验证码
 var input_code=document.getElementById('vcode').value;
 //alert(input_code+"----"+code);
 if(input_code.toLowerCase()==code.toLowerCase())
 {
 //验证码正确(表单提交)
 return true;
 }
 alert("请输入正确的验证码!");
 //验证码不正确,表单不允许提交
 return false;
 }
 </script> 
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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H5+css3+js搭建带验证码的登录页面

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