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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>phonegap_device_network_notification01</title> <link href="../jquery.mobile-1.3.2.css" rel="stylesheet" type="text/css"/> <script src="../jquery.js" type="text/javascript"></script> <script src="../jquery.mobile-1.3.2.js" type="text/javascript"></script> <script src="../cordova.js" type="text/javascript"></script> <style type="text/css"> #ball { position: absolute; z-index: 0; left: 20px; top: 100px; background: #f00; } </style> <script type="text/javascript" charset="utf-8"> var watchID = null; document.addEventListener("deviceready", onDeviceReady, false); function drawCircle(x,y) { var ctx = document.getElementById("ball").getContext(‘2d‘); var rd = 10; ctx.beginPath(); ctx.arc(x, y, rd, 0, Math.PI * 2, false); ctx.closePath(); ctx.fillStyle = "yellow"; ctx.fill(); } function clear() { var ctx = document.getElementById("ball").getContext(‘2d‘); ctx.clearRect(0,0,200,200); } function onDeviceReady() { drawCircle(10,10); startWatch(); } function startWatch() { var options = { frequency: 40 }; watchID = navigator.accelerometer.watchAcceleration(onSuccess, onError, options); } function stopWatch() { if (watchID) { navigator.accelerometer.clearWatch(watchID); watchID = null; } } var oldX = 10, oldY = 10; // 获取加速度信息成功后的回调函数 function onSuccess(newValue) { if(10<=oldX<180&&10<=oldY<180){ clear(); drawCircle(oldX,oldY); } oldX -= newValue.x; oldY += newValue.y; var element = document.getElementById(‘accelerometer‘); element.innerHTML = ‘X: ‘ + oldX + ‘<br />‘ + ‘Y: ‘ + oldY + ‘<br />‘; } // 获取加速度信息失败后的回调函数 function onError() { alert(‘onError!‘); } </script> </head> <body> <div data-role="page"> <div data-role="header"> <h1>PhoneGap100实战</h1> </div> <div data-role="content"> <div id="accelerometer">开启重力感应...</div> <button onclick="stopWatch();">停止重力感应</button> <canvas id="ball" width="200" height="200"></canvas> </div> <div data-role="footer"> <h4> </h4> </div> </div> </body> </html>
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原文地址：http://www.cnblogs.com/LO-ME/p/4574496.html
