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  • [转]你可能不知道的五个强大HTML5 API

    一、全屏

    // 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  
    

    二、页面可见性:判断用户是否正在浏览

    // 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);  
    

    三、使用麦克风和摄像头

    // 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);  
    

    四、电池

    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);  
    
    

    五、prefetch预先加载

    <!-- full page -->  
    <link rel="prefetch" href="http://davidwalsh.name/css-enhancements-user-experience" />  
      
    <!-- just an image -->  
    <link rel="prefetch" href="http://davidwalsh.name/wp-content/themes/walshbook3/images/sprite.png" />  
    
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  • 原文地址:https://www.cnblogs.com/weiyinfu/p/10657778.html
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