css3 - CSS中怎么讓一個div成為遮罩？
問題描述
也就是說讓一個p限定在另一個p的區域里面（類似于css background-image中大尺寸圖片定義在小尺寸的p中，圖像只顯示其在小尺寸p中的部分－－－但是這里不用background-image，而是換成一個p，就不知道怎么實現了 ╮(￣ ￣)╭）
比如這個隨便寫的這個網頁，想讓 .phone:hover 上移的p只顯示其在手機屏幕中的部分
問題解答
回答1：你自己看下，先考慮下布局
<!DOCTYPE html><html xmlns='http://www.w3.org/1999/xhtml'> <head><meta http-equiv='Content-Type' content='text/html; charset=utf-8' /><title>關注ReSur的微信</title><style type='text/css'>body {margin: 0;background-color: #FAFAFA;}.block {position: relative;margin-top: 275px;width: 100%;height: 195px;background: #00C389;}.draw {position: relative;margin: 0 auto;height: 391px;height: 579px;background: url(’http://1992s.com/images/wechat-bg.png’) no-repeat;}.draw_box{margin: 134px 0 0 409px; background:#000; width:219px; height:391px; float:left; overflow:hidden; position:relative;}.phone {position: absolute;top: 137px;left:0;width: 219px;height: 391px;text-align: center;background: white;transition: top 1s;-webkit-transition: top 1s;-moz-transition: top 1s;-o-transition: top 1s;}.phone:hover {top: 0px;}.qrcode {position: relative;top: 87px;margin: 0 auto;width: 165px;height: 165px;background: url(’http://1992s.com/images/wechat.png’) no-repeat;}.text {position: relative;top: 140px;font: 12px 'Lucida Grande','Lucida Sans Unicode',Helvetica,Arial,Verdana,sans-serif,'Microsoft YaHei','微軟雅黑';}</style><link rel='shortcut icon' href='http://m.cgvv.com.cn/favicon.ico' type='image/x-icon' /><script type='text/javascript' src='http://1992s.com/wp-content/themes/portfolio-press-child/js/info.js'></script></head><body><p class='block'> <p class='draw'><p class='draw_box'> <p class='phone'><p class='qrcode'></p><p class='text'> <p>或在“查找公眾號”<br />中搜索“ReSur”</p></p> </p></p> </p></p></body></html>
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