摇一摇.js

    var SHAKE_THRESHOLD = 800;
    var last_update = 0;
    var x = y = z = last_x = last_y = last_z = 0;

    if (window.DeviceMotionEvent) {
        window.addEventListener('devicemotion', deviceMotionHandler, false);
    } else {
        alert('本设备不支持devicemotion事件');
    }

    function deviceMotionHandler(eventData) {
        var acceleration = eventData.accelerationIncludingGravity;
        var curTime = new Date().getTime();

        if ((curTime - last_update) > 100) {
            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;
            var status = document.getElementById("status");

            if (speed > SHAKE_THRESHOLD) {
                doResult();
            }
            last_x = x;
            last_y = y;
            last_z = z;
        }
    }

    function doResult() {
        document.getElementById("result").className = "result";
        document.getElementById("loading").className = "loading loading-show";
        setTimeout(function(){
            //document.getElementById("hand").className = "hand";
            document.getElementById("result").className = "result result-show";
            document.getElementById("loading").className = "loading";
        }, 1000);
    }