[*]// 找到适合浏览器的全屏方法
[*]function launchFullScreen(element) {
[*] if(element.requestFullScreen) {
[*] element.requestFullScreen();
[*] } else if(element.mozRequestFullScreen) {
[*] element.mozRequestFullScreen();
[*] } else if(element.webkitRequestFullScreen) {
[*] element.webkitRequestFullScreen();
[*] }
[*]}
[*]
[*]// 启动全屏模式
[*]launchFullScreen(document.documentElement); // the whole page
[*]launchFullScreen(document.getElementById(“videoElement”)); // any individual element
[p=24, null, left][color=rgb(0, 0, 0)][color=rgb(80, 150, 203)]教程 / [color=rgb(80, 150, 203)]演示[/p][p=24, null, left][color=rgb(0, 0, 0)]2. [color=rgb(80, 150, 203)]页面可见性API（Page Visibility API）[/p][p=24, null, left][color=rgb(0, 0, 0)]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。[/p][color=rgb(0, 0, 0)]Javascript代码
[*]// 设置隐藏属性和可见改变事件的名称，属性需要加浏览器前缀
[*]// since some browsers only offer vendor-prefixed support
[*]var hidden, state, visibilityChange;
[*]if (typeof document.hidden !== ”undefined”) {
[*] hidden = ”hidden”;
[*] visibilityChange = ”visibilitychange”;
[*] state = ”visibilityState”;
[*]} else if (typeof document.mozHidden !== ”undefined”) {
[*] hidden = ”mozHidden”;
[*] visibilityChange = ”mozvisibilitychange”;
[*] state = ”mozVisibilityState”;
[*]} else if (typeof document.msHidden !== ”undefined”) {
[*] hidden = ”msHidden”;
[*] visibilityChange = ”msvisibilitychange”;
[*] state = ”msVisibilityState”;
[*]} else if (typeof document.webkitHidden !== ”undefined”) {
[*] hidden = ”webkitHidden”;
[*] visibilityChange = ”webkitvisibilitychange”;
[*] state = ”webkitVisibilityState”;
[*]}
[*]
[*]// 添加一个标题改变的监听器
[*]document.addEventListener(visibilityChange, function(e) {
[*] // 开始或停止状态处理
[*]}, false);
[p=24, null, left][color=rgb(0, 0, 0)][color=rgb(80, 150, 203)]教程 / [color=rgb(80, 150, 203)]演示[/p][p=24, null, left][color=rgb(0, 0, 0)]3. [color=rgb(80, 150, 203)]getUserMedia API[/p][p=24, null, left][color=rgb(0, 0, 0)]该API允许Web应用程序访问摄像头和麦克风，而无需使用插件。[/p][color=rgb(0, 0, 0)]Javascript代码
[*]// 设置事件监听器
[*]window.addEventListener(“DOMContentLoaded”, function() {
[*] // 获取元素
[*] var canvas = document.getElementById(“canvas”),
[*] context = canvas.getContext(“2d”),
[*] video = document.getElementById(“video”),
[*] videoObj = { ”video”: true },
[*] errBack = function(error) {
[*] console.log(“Video capture error: ”, error.code);
[*] };
[*]
[*] // 设置video监听器
[*] if(navigator.getUserMedia) { // Standard
[*] navigator.getUserMedia(videoObj, function(stream) {
[*] video.src = stream;
[*] video.play();
[*] }, errBack);
[*] } else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
[*] navigator.webkitGetUserMedia(videoObj, function(stream){
[*] video.src = window.webkitURL.createObjectURL(stream);
[*] video.play();
[*] }, errBack);
[*] }
[*]}, false);
[p=24, null, left][color=rgb(0, 0, 0)][color=rgb(80, 150, 203)]教程 / [color=rgb(80, 150, 203)]演示[/p][p=24, null, left][color=rgb(0, 0, 0)]4. [color=rgb(80, 150, 203)]电池API（Battery API）[/p][p=24, null, left][color=rgb(0, 0, 0)]这是一个针对移动设备应用程序的API，主要用于检测设备电池信息。[/p][color=rgb(0, 0, 0)]Javascript代码
[*]var battery = navigator.battery || navigator.webkitBattery || navigator.mozBattery;
[*]
[*]// 电池属性
[*]console.warn(“Battery charging: ”, battery.charging); // true
[*]console.warn(“Battery level: ”, battery.level); // 0.58
[*]console.warn(“Battery discharging time: ”, battery.dischargingTime);
[*]
[*]// 添加事件监听器
[*]battery.addEventListener(“chargingchange”, function(e) {
[*] console.warn(“Battery charge change: ”, battery.charging);
[*]}, false);
[p=24, null, left][color=rgb(0, 0, 0)][color=rgb(80, 150, 203)]教程[/p][p=24, null, left][color=rgb(0, 0, 0)]5. [color=rgb(80, 150, 203)]Link Prefetching[/p][p=24, null, left][color=rgb(0, 0, 0)]预加载网页内容，为浏览者提供一个平滑的浏览体验。[/p][color=rgb(0, 0, 0)]Html代码
[*]<!– full page –>
[*]<link rel=”prefetch” href=”http://davidwalsh.name/css-enhancements-user-experience” />
[*]
[*]<!– just an image –>
[*]<link rel=”prefetch” href=”
” />
[p=24, null, left][color=rgb(0, 0, 0)][color=rgb(80, 150, 203)]教程[/p]
