<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!--MD5工具类-->
<script src="https://cdn.bootcdn.net/ajax/libs/blueimp-md5/2.16.0/js/md5.min.js"></script>
</head>
<body>
<!--
表单绑定提交事件
onsubmit=绑定一个提交检测的函数，true,false
将这个结果返回给表单，使用onsubmit接收
-->
<form action="https://www.baidu.com/" method="post" onclick="return aaa()">
<p>
<span>用户名:</span>
<input type="text" id="username" name="username">
</p>
<p>
<span>密码:</span>
<input type="password" id="input-password">
</p>
<input type="hidden" id="md5-password" name="password">
<!--绑定事件onclick被点击-->
<button type="submit">提交</button>
</form>
<script>
function aaa() {
alert(1);
var uname=document.getElementById('username');
var pwd=document.getElementById('input-password');
var md5pwd=document.getElementById('md5-password');
// pwd.value=md5(pwd.value);
md5pwd.value=md5(pwd.value);
//可以检验判断表单内容，true就是通过提交，false阻止提交
return false;
}
</script>
</body>
</html>