密码框的点击眼睛的显示与隐藏，图标引用是bootstrap中的fontawesome（复制整个 font-awesome 文件夹到您的项目中）还需要引入  <link rel="stylesheet" type="text/css" href="bootstrap.min.css">  <link rel="stylesheet" type="text/css" href="Font-Awesome/css/font-awesome.min.css"><!doctype html><html>    <head>            <meta charset="utf-8">            <title>密码框</title>            <link rel="stylesheet" type="text/css" href="bootstrap.min.css">            <link rel="stylesheet" type="text/css" href="Font-Awesome/css/font-awesome.min.css">    </head><body>    <div class="content">        <div class="input_block">            <i class="fa fa-eye" onclick="hideShowPsw()" id="eye"></i>            <input type="password" id="password" placeholder="密码"/>        </div>    </div>   <script type="text/javascript">            var eye = document.getElementById("eye");            var password = document.getElementById("password");            //隐藏text block，显示password block            function hideShowPsw(){                    if (password.type == "password") {                            password.type = "text";                            eye.className='fa fa-eye-slash'                    }else {                            password.type = "password";                            eye.className='fa fa-eye'                    }                }    </script></body></html>