html 谷歌验证码recaptcha
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<html>
<head>
<title>Loading captcha with JavaScript</title>
</head>
<body>
<form action="" method="POST">
<label>Username: <input type="text" name="username" /></label>
<small>Are you a robot?</small>
<div id="captcha_container"></div>
<input type="submit" value="Submit">
</form>
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="https://www.google.com/recaptcha/api.js?onload=loadCaptcha&render=explicit" async defer></script>
<script type='text/javascript'>
var captchaContainer = null;
var loadCaptcha = function() {
captchaContainer = grecaptcha.render('captcha_container', {
'sitekey' : '6LcoeCkTAAAAAPATFmgjUkDSMYVmwBFw7PzQ-5DM',
'callback' : function(response) {
}
});
};
$('form').on('submit', function (e) {
e.preventDefault();
var response = grecaptcha.getResponse();
//recaptcha failed validation
if(response.length == 0) {
e.preventDefault();
alert('no captcha selected');
}
else {
alert('form submitted');
}
});
</script>
</body>
</html>
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