在点击方法里加这个段代码，由于我这里打开和关闭是同一个按钮，就放到一起了。大家自由使用！
if (!this.showfullScreen) {
// showfullScreen==flase 打开全屏
this.showfullScreen = true;
let docElm = document.documentElement;
if (docElm.requestFullscreen) {
docElm.requestFullscreen();
} else if (docElm.msRequestFullscreen) {
docElm.msRequestFullscreen();
} else if (docElm.mozRequestFullScreen) {
docElm.mozRequestFullScreen();
} else if (docElm.webkitRequestFullScreen) {
docElm.webkitRequestFullScreen();
}
} else {
// 关闭全屏
this.showfullScreen = false;
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.webkitCancelFullScreen) {
document.webkitCancelFullScreen();
}
}
