<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>test</title> <script type="text/javascript" src="http://code.jquery.com/jquery-1.11.0.min.js"></script> <style> .span{ position: absolute; top: 0; left: 0; width: 100%; background: rgba(0,0,0,0.4); height:100%; vertical-align: middle; border-radius: 1px; display:none } .help{ width:1rem; height: 1rem; border: .05rem #fff solid; border-radius: 50%; -webkit-animation: rotation 1s ease-in-out infinite; -moz-animation: rotation 1s ease-in-out infinite; animation: rotation 1s ease-in-out infinite; position: absolute; top:50%; left:50%; margin-top:-.5rem; margin-left:-.5rem; } .help:after{ width: .15rem; height: .15rem; background-color: #fff; border-radius: 100%; position: absolute; content: ""; left:.06rem; top:.1rem; } @-webkit-keyframes rotation{ 0%{-webkit-transform: rotate(0deg);} 100%{-webkit-transform: rotate(360deg);} } @-moz-keyframes rotation{ 0%{-moz-transform: rotate(0deg);} 100%{-moz-transform: rotate(360deg);} } @keyframes rotation{ 0%{transform: rotate(0deg);} 100%{transform: rotate(360deg);} } </style> </head> <body> <div><button id="test" >点击</button></div> <div class="span"> <div class="help"></div> </div> <script> $("#test").click(function () { $('.span').show(); }) </script> </body> </html>