var jsonObject=null;        // 當頁面加載完以后會執行window.onload        window.onload = function() {            var times = -1; // 記錄搖動次數            var last_time = 0;            var borderSpeed = 800;  // 加速度變化臨界值            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執行下面shake函數的代碼            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;                    // 判斷手機確實發生了搖動而不是正常的移動                    if (speed>borderSpeed) {                        times++;                        document.getElementById("text").innerHTML=times+" times";                        // 用戶的微信昵稱和頭像連接發送一次即可，不需要每次都發送                        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>