<form id="customerForm">
<label>
First Name:
<input id="firstName" required />
</label>
<label>
Social Security Number:
<input id="ssn" required pattern="^d{3}-d{2}-d{4}$"
title="Expected pattern is ###-##-####" />
</label>
<input type="submit" />
</form>
解决方法
此时,Safari不支持“必需”输入属性.
http://caniuse.com/#search=required
http://caniuse.com/#search=required
要在Safari上使用“必需”属性,可以使用’webshim‘
1 – 下载webshim
2 – 放这个代码：
<head>
<script src="js/jquery.js"></script>
<script src="js-webshim/minified/polyfiller.js"></script>
<script>
webshim.activeLang('en');
webshims.polyfill('forms');
webshims.cfg.no$Switch = true;
</script>
</head>
