HTML5提供了一些非常强大的JavaScript和HTML API,来帮助开发者构建精彩的桌面和移动应用程序。本文将介绍5个新型的API,希望对你的开发工作有所帮助。
1.
该API允许开发者以编程方式将Web应用程序全屏运行,使Web应用程序更像本地应用程序。
//找到合适的浏览器全屏方法 element.requestFullScreen();
function launchFullScreen(element) {
if(element.requestFullScreen) {
element.requestFullScreen();
} else if(element.mozRequestFullScreen) {
lement.mozRequestFullScreen();
} else if(element.webkitRequestFullScreen) {
element.webkitRequestFullScreen();
}
}
//启动全屏模式 常用于视频
launchFullScreen(document.getElementById("videoElement"));
//退出全屏模式
document.cancelFullScreen();
document.mozCancelFullScreen();
document.webkitCancelFullScreen();
//添加全屏变化事件
element.addEventListener(‘fullscreenchange’, function(e) {
if (document.fullScreen) { // document.webkitIsFullScreen
/* make it look good for fullscreen */
} else {
/* return to the normal state in page */
}
}, false);
//看很多文章都是这样写 但是我试验了一下 好像木有反应
//我再手机播放视频通常使用
video.addEventListener('webkitendfullscreen', function(e) {
alert("退出全屏") }, false); video.addEventListener('webkitbeginfullscreen', function(e) { alert("进入") }, false);2.
该API可以用来检测页面对于用户的可见性,即返回用户当前浏览的页面或标签的状态变化。
//设置页面可见性变化监听 document.addEventListener("visibilitychange",stateChanged); document.addEventListener("webkitvisibilitychange", stateChanged); document.addEventListener("msvisibilitychange", stateChanged);function stateChanged(){ console.log(document.webkitVisibilityState); if(document.hidden || document.webkitHidden || document.msHidden){ alert("hidden") } }
3.
预加载网页内容,为浏览者提供一个平滑的浏览体验。
4.DeviceOrientationEvent是获取方向,得到device静止时的绝对值; DeviceMotionEvent是获取移动速度,得到device移动时相对之前某个时间的差值比
设备定位API,该API允许你收集设备的方向和移动信息。此外,该API只在具备陀螺仪功能的设备上使用。
<html>
<head>
<title>DeviceOrientationEvent</title> <meta charset="UTF-8" /></head><body>
<p>左右:<span id="alpha">0</span> </p> <p>前后:<span id="beta">0</span> </p> <p>扭转:<span id="gamma">0</span> </p> <p>指北针指向:<span id="heading">0</span>度</p> <p>指北针精度:<span id="accuracy">0</span>度</p> <hr /> <p>x轴加速度:<span id="x">0</span>米每二次方秒</p> <p>y轴加速度:<span id="y">0</span>米每二次方秒</p> <p>z轴加速度:<span id="z">0</span>米每二次方秒</p> <hr /> <p>x轴加速度(考虑重力加速度):<span id="xg">0</span>米每二次方秒</p> <p>y轴加速度(考虑重力加速度):<span id="yg">0</span>米每二次方秒</p> <p>z轴加速度(考虑重力加速度):<span id="zg">0</span>米每二次方秒</p> <hr /> <p>左右旋转速度:<span id="Ralpha">0</span>度每秒</p> <p>前后旋转速度:<span id="Rbeta">0</span>度每秒</p> <p>扭转速度:<span id="Rgamma">0</span>度每秒</p> <hr /> <p>上次收到通知的间隔:<span id="interval">0</span>毫秒</p> <script type="text/javascript"> function orientationHandler(event) { document.getElementById("alpha").innerHTML = event.alpha; document.getElementById("beta").innerHTML = event.beta; document.getElementById("gamma").innerHTML = event.gamma; document.getElementById("heading").innerHTML = event.webkitCompassHeading; document.getElementById("accuracy").innerHTML = event.webkitCompassAccuracy;}
function motionHandler(event) { document.getElementById("interval").innerHTML = event.interval; var acc = event.acceleration; document.getElementById("x").innerHTML = acc.x; document.getElementById("y").innerHTML = acc.y; document.getElementById("z").innerHTML = acc.z; var accGravity = event.accelerationIncludingGravity; document.getElementById("xg").innerHTML = accGravity.x; document.getElementById("yg").innerHTML = accGravity.y; document.getElementById("zg").innerHTML = accGravity.z; var rotationRate = event.rotationRate; document.getElementById("Ralpha").innerHTML = rotationRate.alpha; document.getElementById("Rbeta").innerHTML = rotationRate.beta; document.getElementById("Rgamma").innerHTML = rotationRate.gamma; }if (window.DeviceMotionEvent) {
window.addEventListener("devicemotion", motionHandler, false); } else { document.body.innerHTML = "What user agent u r using???"; }if (window.DeviceOrientationEvent) {
window.addEventListener("deviceorientation", orientationHandler, false); } else { document.body.innerHTML = "What user agent u r using???"; }; </script></body></html>