JavaScript实现网页全屏最大化，最小化

fullscreen.js

// 浏览器进入全屏
export const viewFullScreen = function () {
  // 主要，这边要全屏的对象是这个body，如果只是选择点击的对象，比如 e.currentTarget，那么就会变成只有这个按钮全屏
  var docElm = document.documentElement;
  // 浏览器兼容
  if (docElm.requestFullscreen) {
    docElm.requestFullscreen();
  } else if (docElm.msRequestFullscreen) {
    docElm.msRequestFullscreen();
  } else if (docElm.mozRequestFullScreen) {
    docElm.mozRequestFullScreen();
  } else if (docElm.webkitRequestFullScreen) {
    docElm.webkitRequestFullScreen();
  }
};


// 浏览器退出全屏
export const cancelFullScreen = function () {
  // 浏览器兼容
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
  }
};

/**
 * 监听浏览器全屏
 * @param open{Function}
 * @param cancel{Function}
 */
export const listenFullScreen = function (open, cancel) {
  // 浏览器兼容
  if (document.exitFullscreen) {

    document.addEventListener("fullscreenchange", function () {
      (document.fullscreenElement) ? open() : cancel();
    }, false);

  } else if (document.msExitFullscreen) {

    document.addEventListener("msfullscreenchange", function () {
      (document.msFullscreenElement) ? open() : cancel();
    }, false);

  } else if (document.mozCancelFullScreen) {

    document.addEventListener("mozfullscreenchange", function () {
      (document.mozFullScreen) ? open() : cancel();
    }, false);

  } else if (document.webkitCancelFullScreen) {

    document.addEventListener("webkitfullscreenchange", function () {
      (document.webkitIsFullScreen) ? open() : cancel();
    }, false);

  }
};

---

使用全屏事件只能由用户行为触发,由于浏览器安全机制,不允许代码自动触发

viewFullScreen();  // 进入全屏

cancelFullScreen(); // 退出全屏

listenFullScreen(()=>{

  // 监听进入全屏

},()=>{

 // 监听退出全屏
  
})```