// 找到適合瀏覽器的全屏方法
function launchFullScreen(element) {
if(element.requestFullScreen) {
element.requestFullScreen();
} else if(element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if(element.webkitRequestFullScreen) {
element.webkitRequestFullScreen();
}
}
// 啟動(dòng)全屏模式
launchFullScreen(document.documentElement); // the whole page
launchFullScreen(document.getElementById("videoElement")); // any individual element

// 設(shè)置隱藏屬性和可見改變事件的名稱，屬性需要加瀏覽器前綴
// 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";
}
// 添加一個(gè)標(biāo)題改變的監(jiān)聽器
document.addEventListener(visibilityChange, function(e) {
// 開始或停止?fàn)顟B(tài)處理
}, false);

// 設(shè)置事件監(jiān)聽器
window.addEventListener("DOMContentLoaded", function() {
// 獲取元素
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);
};
// 設(shè)置video監(jiān)聽器
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);

var battery = navigator.battery || navigator.webkitBattery || navigator.mozBattery;
// 電池屬性
console.warn("Battery charging: ", battery.charging); // true
console.warn("Battery level: ", battery.level); // 0.58
console.warn("Battery discharging time: ", battery.dischargingTime);
// 添加事件監(jiān)聽器
battery.addEventListener("chargingchange", function(e) {
console.warn("Battery charge change: ", battery.charging);
}, false);

<!-- full page -->
<link rel="prefetch" href="<a />
<!-- just an image -->