考试全屏防作弊解决方案

2021-08-25

考试全屏防作弊解决方案

元素全屏
document.documentElement全屏
退出全屏

javascript

//监听退出全屏事件
    window.onresize = function() {
        if (!checkFull()) {
            //要执行的动作
            $("#dashboard_id").removeClass('expand').addClass('contract');//这里捡个懒，直接用JQ来改className
        }
    }
    function checkFull() {
        var isFull = document.fullscreenEnabled || window.fullScreen || document.webkitIsFullScreen || document.msFullscreenEnabled;
        //to fix : false || undefined == undefined
        if (isFull === undefined) {isFull = false;}
        return isFull;
    }

可能出于安全考虑，只能手动触发才能实现全屏，浏览器自动执行无效果。通过控制台可以看到提示：API can only be initiated by a user gesture。

element.click() 也不可以触发

javascript

Failed to execute 'requestFullscreen' on 'Element': API can only be initiated by a user gesture.

前端开发中如何在JS文件中检测用户浏览器是否打开了调试面板（F12打开开发者工具）？
切屏触发
页面失去焦点触发

js 检测文件对话框是否关闭

无法检测只能使用轮询查询是否全屏：

javascript

me.fullScreenTipTimer = setInterval(()=>{
    if(!me.showTips && !me.isFullScreen()) {
        me.fullScreenTip();
    }
},500);

判断是否全屏

javascript

isFullScreen: function () {
    return  !!(document.fullscreenElement
        || document.msFullscreenElement
        || document.mozFullScreenElement
        || document.webkitFullscreenElement
        || false);
},

手机浏览器全屏