下面是shake.js代碼
(function(global, factory) {
if (typeof define === 'function' && define.amd) {
define(function() {
return factory(global, global.document);
});
} else if (typeof module !== 'undefined' && module.exports) {
module.exports = factory(global, global.document);
} else {
global.Shake = factory(global, global.document);
}
} (typeof window !== 'undefined' ? window : this, function (window, document) {
'use strict';
function Shake(options) {
//feature detect
this.hasDeviceMotion = 'ondevicemotion' in window;
this.options = {
threshold: 15, //默認搖動閾值
timeout: 1000 //默認兩次事件間隔時間
};
if (typeof options === 'object') {
for (var i in options) {
if (options.hasOwnProperty(i)) {
this.options[i] = options[i];
}
}
}
//使用date防止重複調用
this.lastTime = new Date();
//accelerometer values
this.lastX = null;
this.lastY = null;
this.lastZ = null;
//創建自定義事件
if (typeof document.CustomEvent === 'function') {
this.event = new document.CustomEvent('shake', {
bubbles: true,
cancelable: true
});
} else if (typeof document.createEvent === 'function') {
this.event = document.createEvent('Event');
this.event.initEvent('shake', true, true);
} else {
return false;
}
}
//重置時間計時器
Shake.prototype.reset = function () {
this.lastTime = new Date();
this.lastX = null;
this.lastY = null;
this.lastZ = null;
};
//開始監聽 devicemotion
Shake.prototype.start = function () {
this.reset();
if (this.hasDeviceMotion) {
window.addEventListener('devicemotion', this, false);
}
};
//停止監聽 devicemotion
Shake.prototype.stop = function () {
if (this.hasDeviceMotion) {
window.removeEventListener('devicemotion', this, false);
}
this.reset();
};
//計算是否觸發搖動
Shake.prototype.devicemotion = function (e) {
var current = e.accelerationIncludingGravity;
var currentTime;
var timeDifference;
var deltaX = 0;
var deltaY = 0;
var deltaZ = 0;
if ((this.lastX === null) && (this.lastY === null) && (this.lastZ === null)) {
this.lastX = current.x;
this.lastY = current.y;
this.lastZ = current.z;
return;
}
deltaX = Math.abs(this.lastX - current.x);
deltaY = Math.abs(this.lastY - current.y);
deltaZ = Math.abs(this.lastZ - current.z);
if (((deltaX > this.options.threshold) && (deltaY > this.options.threshold)) || ((deltaX > this.options.threshold) && (deltaZ > this.options.threshold)) || ((deltaY > this.options.threshold) && (deltaZ > this.options.threshold))) {
//計算上次觸發搖動到現在的間隔時間
currentTime = new Date();
timeDifference = currentTime.getTime() - this.lastTime.getTime();
if (timeDifference > this.options.timeout) {
window.dispatchEvent(this.event);
this.lastTime = new Date();
}
}
this.lastX = current.x;
this.lastY = current.y;
this.lastZ = current.z;
};
//事件處理
Shake.prototype.handleEvent = function (e) {
if (typeof (this[e.type]) === 'function') {
return this[e.type](e);
}
};
return Shake;
}));
在頁面中創建新實例進行調用
//創建實例
var myShakeEvent = new Shake({
threshold: 10, // 搖動閾值
timeout: 500 // 事件發生頻率,是可選值
});
// 監聽設備動作
myShakeEvent.start();
//添加一個監聽事件
window.addEventListener('shake', shakeEventDidOccur, false);
//搖動回調函數
function shakeEventDidOccur() {
alert('搖了一次');
}