最近项目开发中遇到一个视频窗口全屏切换功能，为此在这里做个记录。

        具体的实现思路：

<template><div class="content-box"><div class="container"><div id="screen" class="screen"><el-button @click="screen()">{{ fullscreen ? "还原" : "最大化" }}</el-button></div></div></div>
</template><script>
export default {data() {return {fullscreen: false,};},mounted() {window.addEventListener("resize", ()=> {if (!this.isFullScreen()) {// 非全屏状态this.fullscreen = false;}});},methods: {//判断是否全屏isFullScreen() {return !!(document.webkitIsFullScreen || this.fullele());},fullele() {return (document.fullscreenElement ||document.webkitFullscreenElement ||document.msFullscreenElement ||document.mozFullScreenElement ||null);},screen() {let element = document.getElementById("screen");if (this.fullscreen) {// 关闭全屏if (document.exitFullscreen) {document.exitFullscreen();} else if (document.webkitCancelFullScreen) {document.webkitCancelFullScreen();} else if (document.mozCancelFullScreen) {document.mozCancelFullScreen();} else if (document.msExitFullscreen) {document.msExitFullscreen();}} else {// 全屏if (element.requestFullscreen) {element.requestFullscreen();} else if (element.webkitRequestFullScreen) {element.webkitRequestFullScreen();} else if (element.mozRequestFullScreen) {element.mozRequestFullScreen();} else if (element.msRequestFullscreen) {// IE11element.msRequestFullscreen();}}this.fullscreen = !this.fullscreen;},},
};
</script><style lang="scss" scoped>
.screen {width: 500px;height: 500px;background-color: #fff;border: 1px solid red;
}
</style>

这里需要监听ESC键，为此做了特殊处理，这里是Demo,跟使用效果图基本差不多