基于HTML5實現(xiàn)類似微信手機搖一搖功能計算動搖次數(shù)

var jsonObject=null;
        // 當網頁加載完以后會實行window.onload
        window.onload = function() {
            var times = -1; // 記錄動搖次數(shù)
            var last_time = 0;
            var borderSpeed = 800;  // 加速度轉變臨界值
            var x = y = z = last_x = last_y = last_z = 0;
            if (window.DeviceMotionEvent) {
                window.addEventListener('devicemotion',shake,false);
            }
            else
            {
                alert('您的設備不支持搖一搖哦');
            }
            // 每次手機移動的時候都會實行下面shake函數(shù)的代碼
            function shake(eventData)
            {
                var acceleration = eventData.accelerationIncludingGravity;
                var curTime = new Date().getTime();
                var diffTime  = curTime-last_time;
                // 每隔100ms進行判斷
                if (diffTime>100) {
                    x = acceleration.x;
                    y = acceleration.y;
                    z = acceleration.z;
                    var speed = Math.abs(x + y + z - last_x - last_y - last_z) / diffTime * 10000;
                    // 判斷手機確實發(fā)生了動搖而不是正常的移動
                    if (speed>borderSpeed) {
                        times++;
                        document.getElementById("text").innerHTML=times+" times";
                        // 用戶的微信昵稱和頭像連接發(fā)送一次即可，不必要每次都發(fā)送
                        if (times==0)
                        {
                            document.forms["insertForm"].headimg.value =img ;
                            document.forms["insertForm"].user.value = nickname;
                        }
                        document.forms["insertForm"].time.value = times;
                    }
                    last_time = curTime;
                    last_x = x;
                    last_y = y;
                    last_z = z;
                }
            }
        }

<img src="hand.png">
<br/><font size="16" color="red" id="text"></font>