var gs:Sound = new GhostSound();
gs.play(0, int.MAX_VALUE, new SoundTransform(0));

setInterval(callSWF, 50);
function callSWF()
{
var swf=document.getElementById("swfID");
if(swf)swf.execSomeMethod();
}

ie = !+"\v1" ; //可行
ie ='\v'=='v' ;//可行，以前用过，传说最短的判断IE代码，貌似没上面那条短
ie = 0//@cc_on+1;//不可行，这样写就会语法错误了，我修改如下
ie = 0/*@cc_on+1@*/;
ie = !!top.execScript;//Chrome也支持，所以不能用
ie = /*@cc_on!@*/!1;//可行，条件编译
ie8 = !!window.XDomainRequest;//可行

//如果是IE，会返回6,7,8代表ie6,ie7,ie8，否则返回1
IEVersion = (" " + (/*@cc_on @_jscript_version  @*/-1)).slice(-1)//可用

//基于条件编译的嗅探脚本，还有如下几个：（实际使用这些都有错误）
IE8=@cc_on @_jscript_version == 5.8 ? true : @false
IE7=@cc_on @_jscript_version == 5.7 ? true : @false
IE6=@cc_on @_jscript_version == 5.6 ? true : @false
IE55=@cc_on @_jscript_version == 5.5 ? true : @false
//10-31添加
//我进行了改写，测试可行
ie6 = /*@cc_on @_jscript_version == 5.6 ||@*/false;
ie7 = /*@cc_on @_jscript_version == 5.7 ||@*/false;
ie8 = /*@cc_on @_jscript_version == 5.8 ||@*/false;
ie5 = /*@cc_on @_jscript_version == 5.5 ||@*/false;

ff = /a/[-1]=='a';//可行
//下面不推荐了，ff2的代码在ff3也能通过，再加上除IE外的浏览器版本判断并不重要
ff3 = (function  x(){})[-5]=='x';
ff2 = (function x(){})[-6]=='x';

safari=/a/.__proto__=='//';//可行
safari = window.openDatabase;//不可行，chrome也支持

chrome=/source/.test((/a/.toString+''));//可行

opera=!!window.opera ;//这个很熟悉了
opera=/^function (/.test([].sort);//不可行……

browsers : {
ieVer : (" " + (/*@cc_on @_jscript_version  @*/-1)).slice(-1),
ie5 : /*@cc_on @_jscript_version == 5.5 ||@*/false,
ie6 : /*@cc_on @_jscript_version == 5.6 ||@*/false,
ie7 : /*@cc_on @_jscript_version == 5.7 ||@*/false,
ie8 : /*@cc_on @_jscript_version == 5.8 ||@*/false,
ie : '\v'=='v',
ff : /a/[-1]=='a',
safari : /a/.__proto__=='//',
chrome : /source/.test((/a/.toString+'')),
opera : !!window.opera
}

browsers : {
ie : window.ActiveXObject ? navigator.userAgent.toLowerCase().match(/msie ([\d.]+)/)[1] : 0,
firefox : document.getBoxObjectFor ? navigator.userAgent.toLowerCase().match(/firefox\/([\d.]+)/)[1] : 0,
chrome : window.MessageEvent && !document.getBoxObjectFor ? navigator.userAgent.toLowerCase().match(/chrome\/([\d.]+)/)[1] : 0,
safari : window.openDatabase ? navigator.userAgent.toLowerCase().match(/version\/([\d.]+)/)[1] : 0,
opera : window.opera ? navigator.userAgent.toLowerCase().match(/opera.([\d.]+)/)[1] : 0
}

var Sys = {};
        var ua = navigator.userAgent.toLowerCase();
        if (window.ActiveXObject)
            Sys.ie = ua.match(/msie ([\d.]+)/)[1]
        else if (document.getBoxObjectFor)
            Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1]
        else if (window.MessageEvent && !document.getBoxObjectFor)
            Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1]
        else if (window.opera)
            Sys.opera = ua.match(/opera.([\d.]+)/)[1]
        else if (window.openDatabase)
            Sys.safari = ua.match(/version\/([\d.]+)/)[1];

var Sys = {};
        var ua = navigator.userAgent.toLowerCase();
        window.ActiveXObject ? Sys.ie = ua.match(/msie ([\d.]+)/)[1] :
        document.getBoxObjectFor ? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1] :
        window.MessageEvent && !document.getBoxObjectFor ? Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1] :
        window.opera ? Sys.opera = ua.match(/opera.([\d.]+)/)[1] :
        window.openDatabase ? Sys.safari = ua.match(/version\/([\d.]+)/)[1] : 0;

var Sys = {};
        var ua = navigator.userAgent.toLowerCase();
        var s;
        (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
        (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
        (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
        (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
        (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;

(function (win, doc) {
    var isIE = !','.split(/,/).length,
        isIE6 = isIE && !win.XMLHttpRequest,
        isIE8 = !!win.XDomainRequest,
        isIE9 = isIE && !!+'\v1',                                 // alt: !!-[1,]
        isIE7 = isIE && !isIE6 && !isIE8 && !isIE9,
        isFF = !!doc.getBoxObjectFor || 'mozInnerScreenX' in win, // gecko
        isOP = !!win.opera && !!win.opera.toString().indexOf('Opera'),
        isOP9 = /^function \(/.test([].sort),
        isWK = !!win.devicePixelRatio,                            // web-kit
        isSF = /a/.__proto__ == '//',                             // safari
        isCR = /s/.test(/a/.toString);                            // chrome
})(window, document);