Mobile phone-shaking function code implementation

The Web page of the mobile phone shake effect, JS code as follows

var speed;//to determine if the phone has a shake function if (window. Devicemotionevent) {//Bind Devicemotion event Window.addeventlistener (' Devicemotion ', Devicemotionhandler, false);}    else{alert (' Your device does not support shake-shake function, the system will automatically shake your phone ^_^ ');    Speed = 888;  Do not support shake when shaking, modify speed value trigger Shake Phone event}//initialize var shake_threshold = 800;var last_update = 0;var x, y, Z, last_x, last_y, last_z;function    Devicemotionhandler (eventData) {var acceleration =eventdata.accelerationincludinggravity;    var curtime = new Date (). GetTime ();        if ((curtime-last_update) >) {var difftime = curtime-last_update;        Last_update = Curtime;        x = acceleration.x;        y = acceleration.y;        z = acceleration.z;        Speed = Math.Abs (x +y + z-last_x-last_y-last_z)/difftime * 10000;        Speed = 888;        if (Speed > Shake_threshold) {alert ("shaked!") when the velocity is higher than the threshold value;        } last_x = x;        last_y = y;    Last_z = Z; }}

　　

Mobile phone-shaking function code implementation