function AudioHelper() {
    function isSupportOgg() {
        var tmp = document.createElement('audio');
        return tmp.canPlayType && "" != tmp.canPlayType('audio/ogg;codecs="vorbis"');
    }
    function soundHandle() {
        var tempS, ifValid;
        
        do {
            tempS = soundIdArr.pop();
            ifValid = typeof (tempS) !== "undefined";
            if (ifValid) {
                var dom = document.getElementById(tempS);
                if (dom !== null) 
                    dom.load();
            }
        } while (ifValid);
        window.removeEventListener(eventName, soundHandle, true);
    }
    function createAudio(soundfile) {
        var divBom = document.createElement('div');
        divBom.innerHTML = '<audio><source src="' + soundfile + (isOgg ? ".ogg" : ".mp3") + '" type="' + (isOgg ? "audio/ogg" : "audio/mpeg") + '"/></audio>';
        return divBom.childNodes[0];
    }
    var userAgent = navigator.userAgent.toLowerCase(); //取得浏览器的userAgent字符串  
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("msie") > -1; //判断是否IE<11浏览器
    var ieVersion = 0;
    if (isIE) {
        try {
            if (document.documentMode)
                ieVersion = document.documentMode;
            else ieVersion = userAgent.match(/msie ([\d.]+)/)[1];
        }
        catch (e) {
            ieVersion = 0;
        }
    }
    var isSwf = isIE && ieVersion < 9;
    var isOgg = !isSwf && isSupportOgg();
    var soundfileHash = new Object();
    var soundIdArr = [];
    var eventName = /i(phone|p(o|a)d)/.test(userAgent) ? "touchstart" : "touchend";
    this.init = function (id, soundfile) {
        var ifChange = soundfileHash[id] !== soundfile;
        if (ifChange)
            soundfileHash[id] = soundfile;
        
        if (typeof (soundfile) !== "string")
            return false;

        var dom = document.getElementById(id);
        var hasDom = dom != null;
        if (isSwf)
        {
            if (hasDom)
                return true;
            dom = document.createElement("div");
        }
        else {
            if (hasDom)
            {
                if (!ifChange)
                    return true;
                document.body.removeChild(dom);
            }
            soundIdArr.push(id);
            dom = createAudio(soundfile); 
            if ('on' + eventName in document.documentElement) {
                window.removeEventListener(eventName, soundHandle, true);
                window.addEventListener(eventName, soundHandle, true);
            }
            dom.style.display = "none";
        }
        dom.id = id;
        document.body.appendChild(dom);
        return true;
    }
    this.play = function (id) {
        var soundfile = soundfileHash[id];
        if (typeof (soundfile) !== "string")
            return false;

        var dom = document.getElementById(id);
        if (dom) {
            if (isSwf) {
                soundfile = soundfile + ".swf";
                if (ieVersion < 6)
                    dom.innerHTML = "<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0' width='1' height='1'><param name='movie' value='" + soundfile + "'><param name='quality' value='high'><param name='wmode' value='transparent'><embed src='" + soundfile + "' quality='high' pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash' width='1' height='1'></embed></object>";
                else
                    dom.innerHTML = "<embed src='" + soundfile + "' quality='high' pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash' width='1' height='1' autostart=true hidden=true></embed>";
            }
            else dom.play();
        }
    }
}
var audioHelper = new AudioHelper();
/* 例子
初始化一次或者修改文件:audioHelper.init("playSound", "/files/audio/nba/sound");
播放:audioHelper.play("playSound")
*/