Web pages play sound automatically

<script type= "Text/javascript" src= "jquery-1.7.2.min.js" ></script><script type= "Text/javascript" >$ (function () {//refer to the following two sites for an introduction//http://www.w3school.com.cn/html/html_audio.asp//http://www.zhanxin.info/ Development/2013-05-17-html5-audio.htmlif ($.browser.msie && $.browser.version== ' 8.0 ') {//originally used here is < Bgsound src= "System.wav"/> the result IE8 not play the sound, so replaced by embed$ (' #newMessageDIV '). html (' <embed src= ' system.wav '/> ');} The else{//ie9+,firefox,chrome supports <audio/>$ (' #newMessageDIV '). html (' <audio autoplay= ' AutoPlay ' >< SOURCE src= "System.wav" ' + ' type= "audio/wav"/><source src= "System.mp3" type= "Audio/mpeg"/></audio> ') ;}}); </script><div id= "Newmessagediv" style= "Display:none" ></div>

Web page plays sound automatically