前言
学前端最基本的登录页面肯定要会写，那登录页面里面的密码框的功能设计就需要好好打磨，主要功能有显示密码明文，密码检测信息提示等等，那么本篇博客将写写这些功能结合js怎么做，很简单，看一下就会了。
显示隐藏密码明文
1.用到的图片素材
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .box{ position: relative; width: 400px; border-bottom: 1px solid #ccc; margin: 100px auto; } .box input{ width: 370px; height: 30px; border: 0; outline: none; } .box .image{ position: absolute; top:2px; right: 2px; border: 1px solid #ccc; background-color: #ccccccba; border-radius: 50%; overflow: hidden; } .box img{ vertical-align: bottom; /*父盒子是由img撑开的，所以要去除下面的间隙*/ width: 22px; } </style> </head> <body> <div class="box"> <div class="image"> <img src="close.png" alt="" id="img"> </div> <input type="password" id="pwd"> </div> <script> var img = document.getElementById('img'); var pwd = document.getElementById('pwd'); var flag = 0; img.onclick = function(){ if(flag == 0){ pwd.type = 'text'; this.src='open.png'; // this指向事件函数的调用者，即img flag = 1; }else{ pwd.type = 'password'; this.src='close.png'; flag = 0; } } </script> </body> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .register{ width: 600px; margin: 100px auto; } .ipt{ width: 250px; border: 1px solid #999; outline: none; } .message{ display: inline-block; height: 20px; font-size: 12px; color: #999; background: url(mess.png) no-repeat left center; padding-left: 30px; } .wrong{ color: red; background: url(wrong.png) no-repeat left center; } .right{ color: green; background: url(right.png) no-repeat left center; } </style> </head> <body> <div class="register"> <input type="password" class="ipt"> <p class="message">请输入6~16位密码</p> </div> <script> var ipt = document.querySelector('.ipt'); var msg = document.querySelector('.message'); ipt.onfocus = function(){ this.style.borderColor = 'skyblue' } ipt.onblur = function(){ this.style.borderColor = '#999'; if(this.value.length<6 || this.value.length>16){ msg.className = 'message wrong'; msg.innerHTML = '你输入的位数不符合要求6~16位！'; }else{ msg.className = 'message right'; msg.innerHTML = '你输入的正确！'; } } </script> </body> </html>
![node使用token来实现前端验证码和登录功能详细流程[供参考]=‘很值得‘](https://ucc.alicdn.com/3rkpnpbboddyy/developer-article1611150/20240924/6d75171d53ae4374be44c9d91a3bd8f0.png?x-oss-process=image/format,webp/resize,h_160,m_lfit)