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What are the powerful HTML5 API functions

2025-02-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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本篇内容介绍了"有哪些强大的HTML5 API函数"的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!

1. 全屏API(Fullscreen API)

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。

代码如下:

// 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

2. 页面可见性API(Page Visibility API)

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。

代码如下:

// 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);

3. getUserMedia API

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。

代码如下:

// 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);

4. 电池API(Battery API)

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。

代码如下:

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);

5. Link Prefetching

预加载网页内容,为浏览者提供一个平滑的浏览体验。

代码如下:

"有哪些强大的HTML5 API函数"的内容就介绍到这里了,感谢大家的阅读。如果想了解更多行业相关的知识可以关注网站,小编将为大家输出更多高质量的实用文章!

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