var Shaker = function(f){
// 搖一搖: 檢測到3次搖動算一次搖一搖, 搖動后調(diào)用處理函數(shù), 不再檢測搖動
// f 搖動后的回調(diào)
this.callback = f;
this.status = 0; // 0: 偵聽未開始 1: 偵聽開始 
this.speed = 15;
this.lastX = this.lastY = this.lastZ = 0;
this.num = 0; // 檢測觸發(fā)次數(shù)
this.minNum = 3; // 最小檢測觸發(fā)次數(shù)
this.beginSecond = 0; // 開始檢測的秒數(shù)
this.maxSecond = 3; // 最大間隔秒數(shù)
this.handlerWrap = function(){};
}
Shaker.prototype.listen = function(){
// 偵聽搖動
var that = this;
if (this.status == 0 && window.DeviceMotionEvent) {
this.status = 1;
this.handlerWrap = function(event){
that.handler(event)
}
window.addEventListener('devicemotion', this.handlerWrap, false);
}
}
Shaker.prototype.release = function(){
// 停止偵聽
if(this.status == 1){
if (window.DeviceMotionEvent) {
window.removeEventListener('devicemotion', this.handlerWrap);
}
this.status = 0;
this.num = 0;
}
}
Shaker.prototype.reset = function(){
// 重置檢測
if(this.status == 1){
this.num = 0;
}
}
Shaker.prototype.handler = function(event){
// 傳感器事件處理
if(this.status == 1){
var acceleration =event.accelerationIncludingGravity;
var x = acceleration.x;
var y = acceleration.y;
var z = acceleration.z;
if( Math.abs(x-this.lastX) > this.speed || 
Math.abs(y-this.lastY) > this.speed || 
Math.abs(z-this.lastZ) > this.speed ) 
{
if(this.num == 0){
this.beginSecond = Date.parse(new Date()) / 1000
}
this.num += 1;
}
this.lastX = x;
this.lastY = y;
this.lastZ = z;
if(this.num >= this.minNum){
var now = Date.parse(new Date()) / 1000;
if(now - this.beginSecond <= this.maxSecond){
this.release();
if(this.callback){
this.callback();
}
}
this.reset();
}
}
}

var s = new Shaker(function(){ /*搖動后的回調(diào)*/ });
s.listen();