javascript - 如何使用 confirm() 将整个网页更改为全屏？

Question

我希望在确认框中单击“确定”时整个网页进入全屏模式，但这样只会出现错误 TypeError: docelem.requestFullscreen is not a function。我什么都试过了……

var conf = confirm("Fullscreen mode?");
var docelem = document.documentElement;
if (conf == true) {
    docelem.requestFullscreen();
}
else if (conf == true) {
    docelem.mozRequestFullScreen();
}
else if (conf == true) {
    docelem.webkitRequestFullScreen();
}
else if (conf == true) {
    docelem.msRequestFullscreen();
}

一些解决方案？还是不能使用 confirm()？因为使用按钮有效:

(function () {
    var fullscreenon = document.getElementById("fullscreenbutton");//button Id
    if (fullscreenon) {
        fullscreenon.addEventListener("click", function () {
            var docelem = document.documentElement;
            if (docelem.requestFullscreen) {
                docelem.requestFullscreen();
            }
            else if (docelem.msRequestFullscreen) {
                docelem.msRequestFullscreen();
            }
            else if (docelem.mozRequestFullScreen) {
                docelem.mozRequestFullScreen();
            }
            else if (docelem.webkitRequestFullScreen) {
                docelem.webkitRequestFullScreen();
            }
        }, false);
    }
})();

Answer 1

首先，您的两个样本的条件不同。正确的代码是:

var conf = confirm("Fullscreen mode?");
var docelem = document.documentElement;

if (conf == true) {
    if (docelem.requestFullscreen) {
        docelem.requestFullscreen();
    }
    else if (docelem.mozRequestFullScreen) {
        docelem.mozRequestFullScreen();
    }
    else if (docelem.webkitRequestFullscreen) {
        docelem.webkitRequestFullscreen();
    }
    else if (docelem.msRequestFullscreen) {
        docelem.msRequestFullscreen();
    }
}

其次，也是重要的一点，您无法在没有用户交互的情况下全屏显示您的页面。这是一个安全限制。如果您通过用户点击触发上面的代码，它将起作用。例如:

document.onclick = function (argument) {
    var conf = confirm("Fullscreen mode?");
    var docelem = document.documentElement;

    if (conf == true) {
        if (docelem.requestFullscreen) {
            docelem.requestFullscreen();
        }
        else if (docelem.mozRequestFullScreen) {
            docelem.mozRequestFullScreen();
        }
        else if (docelem.webkitRequestFullScreen) {
            docelem.webkitRequestFullScreen();
        }
        else if (docelem.msRequestFullscreen) {
            docelem.msRequestFullscreen();
        }
    }
}

如果您单击页面上的任意位置，将激活全屏模式。更多详情:https://stackoverflow.com/a/20533579/198062