JS 实现全屏切换，移动端适用
直接看代码吧，简单，只是有些人不知道这个 api，我之前就不知道…
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body><button onclick="test()">点我切换全屏</button></body><script>function test() {if (document.fullscreenElement) {document.exitFullscreen()} else {document.documentElement.requestFullscreen()}}</script></html>
文档链接：/zh-CN/docs/Web/API/Document/exitFullscreen
