typescript设置全屏

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fullScreen() {
document.getElementById("fullScreen").style.display = "none";
document.getElementById("exitScreen").style.display = "block";
let el = document.documentElement as any;
let rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullscreen;
if (typeof rfs != "undefined" && rfs) {
rfs.call(el);
};
return;
} //退出全屏
exitScreen() {
document.getElementById("fullScreen").style.display = "block";
document.getElementById("exitScreen").style.display = "none";
let cfs = document as any;
if (cfs.exitFullscreen) {
cfs.exitFullscreen();
}
else if (cfs.webkitCancelFullScreen) {
cfs.webkitCancelFullScreen();
}
else {
cfs.msExitFullscreen();
}
}