<head> ???<script type="text/javascript" src="jquery.min.js"></script> ???<script type="text/javascript" src="jquery.placeholder.js"></script></head><body> ???<input type="text" placeholder="账号" value=""> ???<input type="password" placeholder="密码" value=""></body><script> ???$("input").placeholder();</script>
jquery.placeholder.js解决IE8兼容h5中input属性placeholder属性
原文地址：https://www.cnblogs.com/dyy-dida/p/9072294.html