有道学堂微信二维码返回顶部代码基于jquery.js制作，返回顶部按钮默认隐藏，滚动页面滚动条时会显示，支持设置一个QQ客服、一个微博账号、一个微信二维码。-Wealth school micro-channel two-dimensional code Back to top code is based jquery.js production, back to top button hidden by default, scroll the page will display a scroll bar, customer service support to set up a QQ, a microblogging account, a micro-channel two-dimensional code.