<script type="text/javascript" src="./files-m/jquery-1.9.1.min.js"></script><script >//网页加载时运行$(function(){navHeader();$(window).scroll(function () {navHeader();})function navHeader() {if ($(window).scrollTop() > 0) {$(".m_nav").addClass("light");} else {$(".m_nav").removeClass("light");}}})</script><style>.light{background: rgba(255,255,255,.98);transition: all 0.4s ease 0s;//动画效果}.m_nav{width:100%; height:50px;}</style><html><div class="m_nav">导航条</div></html>
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