html5 JavaScript 邮箱地址验证

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<!doctype html>
<html lang="en">
<head>
<meta charset=utf-8 />
<title>html5 网页特效邮箱地址验证</title>
<style>
body, input, textarea {
font-family: "helvetica", arial, helvetica;
}
label {
display: block;
float: left;
clear: left;
text-align: right;
width: 100px;
margin-right: 10px;
}

div { padding: 10px; }

fieldset { border: 1px solid #ccc; margin-bottom: 20px; }

</style>
</head>
<body>
<form>
<fieldset>
<legend>some bits about you</legend>
<div><label for="email">email:</label> <input id="email" name="email" type="email" /></div>

    <div><label for="url">homepage:</label><input id="url" type="url" name="url" required /></div>
    <div><textarea name="comment" cols="100" rows="5" required></textarea></div>
</fieldset>
<input type="submit" />
</form>
<script>
// default validation messages
var messages = {
email: 'be not a legal email address',
url: 'be not a valid web address',
comment: 'ye have to specify ye value'
};
var forms = document.getelementsbytagname('form'), i = forms.length, j, el;
while (i--) {
j = forms[i].length;
while (j--, el = forms[i][j]) {
    if (el.willvalidate && messages[el.name]) {
      el.setcustomvalidity(messages[el.name]);
    }
}
}
</script>
<script>
var form = document.getelementsbytagname('form')[0];
form.onsubmit = function (event) {
var i = this.length, el, cont = true, errors = [];
while (i--, el = this[i]) {
    if (el.willvalidate) {
      if (!el.validity.valid) {
        errors.push('error with ' + el.name + (el.validationmessage ? ': ' + el.validationmessage: ''));
        cont = false;
      }
    }
}

if (errors.length) {
    // replace alert with your sexy css教程 info bubbles
    alert(errors.join('n'));
}