移动端h5摇一摇事件

//        摇一摇动作

//获取加速度信息

//通过监听上一步获取到的x, y, z 值在一定时间范围内的变化率，进行设备是否有进行晃动的判断。

//而为了防止正常移动的误判，需要给该变化率设置一个合适的临界值。

        var SHAKE_THRESHOLD = 4000;

        var last_update = 0;

        var x, y, z, last_x = 0, last_y = 0, last_z = 0;

        function deviceMotionHandler(eventData) {

            var acceleration =eventData.accelerationIncludingGravity;

            var curTime = new Date().getTime();

            if ((curTime-last_update)> 10) {

                var diffTime = curTime -last_update;

                last_update = curTime;

                x = acceleration.x;

                y = acceleration.y;

                z = acceleration.z;

                var speed = Math.abs(x +y + z - last_x - last_y - last_z) / diffTime * 10000;

                if (speed > SHAKE_THRESHOLD) {

                    $('.slide_06_text').fadeOut();

                    $('.milk_01').animate({top:'0'},1000);

                    $('.milk_02').show().animate({bottom:'0'},2000);

                    $('.yao_tips_01').animate({top:'5%'},1500);

                    $('.yao_tips_02').show().animate({bottom:'5%'},2000);

                    setTimeout(function(){

                        $('.slide_06').fadeOut();

                        $('.slide_04').fadeIn();

                    },2500);

                }

                last_x = x;

                last_y = y;

                last_z = z;

            }

        }