test.html
Html code
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery</title>
<style type="text/css">
</style>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function (){
$("#show").click(function (){
var iframeObj = $(window.frames["iframe_name"].document);
alert(iframeObj.find("#un").val());
});
});
</script>
</head>
<body>
<input type="button" id="show" value="show" />
<iframe id="iframe_id" name="iframe_name" src="http://localhost/test/login.html"></iframe>
</body>
</html>login.html
Html code
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>登录页面</title> </head> <body> <form method="POST" action="#"> 用户名：<input id="un" type="text" name="username" value="123d" /> 密 码：<input type="text" name="password"/> <input type="submit" value="提交"> </form> </body> </html>
Note: must come from the same source
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
