//audio

            $.audio = function(params) {

                var $audio = {};

                $audio.methods = {

                    init: function() {

                        this.loop = params.loop || '';

                        this.id = params.id || '';

                        this.volume = params.volume || ;

                        this.mp3 = params.mp3 || '';

                        this.ogg = params.ogg || '';

                        var audioHtml = '<audio id="' + this.id + '" autoplay="autoplay" loop src="' + this.mp3 + '" preload="auto"></audio>';

                        $(".music").append(audioHtml);

                    },

                    play: function() {

                        document.getElementById(this.id).play();

                    },

                    stop: function() {

                        document.getElementById(this.id).pause();

                    },

                    soundVolume: function(value) {

                        document.getElementById(this.id).volume = value;

                    },

                    delAudio: function() {

                        $("#" + this.id).remove();

                    }

                };

                $audio.methods.init();

                return $audio.methods;

            };

 audio = new $.audio({ id: "sound", mp3: "images/britax.mp3", loop: "loop" });

            audio.play();

            getWechatVersion();

            if (getWechatVersion()) {

                audio.stop();

                $('.playon').show();

                $('.playoff').hide();

            }

$('.playon').click(function() {

                audio.stop();

                $('.playon').hide();

                $('.playoff').show();

            });

            $('.playoff').click(function() {

                audio.play();

                $('.playon').show();

                $('.playoff').hide();

            });