<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>登录</title>
<link href="css/bootstrap.min.css" rel="stylesheet"></head><body><nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="./">jsp作业</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li><a href="login.html">登录</a></li>
</ul>
</div>
</div></nav><div class="container">
<div class="row">
<div class="col-md-4">
</div>
<div class="col-md-4">
<form class="form-signin" target="submitFrame" method="post">
<h2 class="form-signin-heading">登录到jsp作业</h2>
<label for="inputEmail">Email</label>
<input type="email" id="inputEmail" class="form-control" placeholder="请输入Email" required autofocus><br>
<label for="inputPassword">密码</label>
<input type="password" id="inputPassword" class="form-control" placeholder="请输入密码" required>
<div class="checkbox">
<label>
<input type="checkbox" value="remember-me" checked="checked">记住密码</label>
</div>
<button type="submit" class="btn btn-primary" id="btn-login">登录</button>
<a href="reg.html" class="btn btn-default">注册</a>
</form>
<iframe style="display: none" name="submitFrame" src="about:blank"></iframe>
</div>
<div class="col-md-4">
</div>
</div>
<script src="js/jquery.min.js"></script></body></html>
可以用html进行程序编写，从而实现系统登陆界面文本框前有小图案的需求。可参照以下代码为模板进行编写：完整的代码1：https://download.csdn.net/download/mingzi1245/12406208 代码2https://download.csdn.net/download/mingzi1245/12406204
html是超文本标记语言（英语：HyperText Markup Language，简称：HTML）是一种用于创建网页的标准标记语言。您可以使用 HTML 来建立自己的 WEB 站点，HTML 运行在浏览器上，由浏览器来解析。
写js啊，<script>
var username = document.getElementsClassName('bt_input')[0]
var password = document.getElementsClassName('bt_input')[1]
var button= document.getElementsClassName('logingBut')[0]
button.onclick=function(){
if(username .value=="user"&&password .value=="123456"){
location.href="下一个网页的网址"
}else{
alert("账号或密码错误！")
window.opener = null
window.open("", "_self")
window.close()
}
}
</script>
把这段代码放在</body>前面就好了，，纯手打，采纳哈
