后台提示新消息（声音）

var borswer = window.navigator.userAgent.toLowerCase();
if ( borswer.indexOf( "ie" ) >= 0 )
{
//IE内核浏览器
var strEmbed = '<embed name="embedPlay" src="ding.wav" autostart="true" hidden="true" loop="false"></embed>';
if ( $( "body" ).find( "embed" ).length <= 0 )
$( "body" ).append( strEmbed );
var embed = document.embedPlay;

//浏览器不支持 audion，则使用 embed 播放
embed.volume = 100;
//embed.play();
} else
{
//非IE内核浏览器
var strAudio = "<audio id='audioPlay' src='ding.wav' hidden='true'>";
if ( $( "body" ).find( "audio" ).length <= 0 )
$( "body" ).append( strAudio );
var audio = document.getElementById( "audioPlay" );

//浏览器支持 audion
audio.play();
}