h5判断手机摇晃

代码如下：

var count = 0;
function shakeFun(){  //判断手机摇晃
    if(window.DeviceMotionEvent) {
        var speed = 10;
        var x = y = z = lastX = lastY = lastZ = 0;
        window.addEventListener('devicemotion', function(){
            var acceleration =event.accelerationIncludingGravity;
            x = acceleration.x;
            y = acceleration.y;
            if(Math.abs(x-lastX) > speed || Math.abs(y-lastY) > speed) {                   
                count++;
                if(count == 1 ){ //避免摇晃中多次触发事件
                    function shake(){ //摇晃时展示的动效                        
                        $(".center_phone").css("transform","rotate(16deg)");                        
                        setTimeout(function(){
                            $(".center_phone").css("transform","rotate(-16deg)");                            
                        },200); 
                        var audio = document.getElementById('audio');//获取audio元素
                        audio.play();
                    };
                    var timer =  setInterval(shake,500);//每隔1秒执行一次                       
                    setTimeout(function(){
                        clearInterval(timer);                        
                    },3000);
                    setTimeout(function(){ //摇晃后触发事件  
　　　　　　　　　　　　　　count = 0;                     
                        showDia();                                            
                    },4000);
                }
            }
            lastX = x;
            lastY = y;
        }, false);
    }
};