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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <!--
 * @Author: OBKoro1
 * @Github: https://github.com/OBKoro1
 * @Date: 2018-11-15 18:49:33
 * @LastEditors: OBKoro1
 * @LastEditTime: 2018-11-23 18:20:36
 * @Description: 浏览器全屏class类演示demo
 -->
<div class="top">
  <button onclick="leftScreen()">左边全屏</button>
  <button onclick="rightScreen()">右边全屏</button>
</div>
<div class="main">
  <div class="left">
    <button onclick="redScreen()">红色全屏</button>
    <button onclick="exitScreen()">退出全屏</button>
    <div class="left-son">
      <button onclick="exitScreen()">红色退出全屏</button>
      <span>左边的内容</span>
    </div>
  </div>
  <div class="right">右边的内容</div>
</div>
            
          
!
            
              .top {
  margin: 15px;
}
.main {
  width: 100%;
  height: 1000px;
  display: flex;
}
.left {
  width: 50%;
  height: 60%;
  background: gray;
  padding: 20px;
}
.left-son {
  width: 80%;
  height: 50%;
  margin: 15px;
  background: red;
}
.right {
  width: 50%;
  height: 60%;
  background: #dddddd;
}
/* 针对dom的全屏设置 */
.left:-webkit-full-screen {
  background: #fff;
}
/* 全屏属性 */
:-webkit-full-screen {
}
:-moz-full-screen {
}
:-ms-fullscreen {
}
/* 全屏伪类 当前chrome:70 不支持 */
:full-screen {
}
:fullscreen {
  /* IE11支持 */
}

            
          
!
            
              class fullScreen {
  /**
   * @description: 全屏初始化
   * @param {Function} fn 用户浏览器不支持全屏的回调
   */
  constructor(fn) {
    this.prefixName = ""; // 浏览器前缀
    this.isFullscreenData = true; // 浏览器是否支持全屏
    this.isFullscreen(fn);
  }
  /**
   * @description: 将传进来的元素全屏
   * @param {String} domName 要全屏的dom名称
   */
  Fullscreen(domName) {
    const element = document.querySelector(domName);
    const methodName =
      this.prefixName === ""
        ? "requestFullscreen"
        : `${this.prefixName}RequestFullScreen`;
    element[methodName]();
  }
  // 退出全屏
  exitFullscreen() {
    const methodName =
      this.prefixName === ""
        ? "exitFullscreen"
        : `${this.prefixName}ExitFullscreen`;
    document[methodName]();
  }
  /**
   * @description: 监听进入/离开全屏
   * @param {Function} enter 进入全屏的回调
   *  @param {Function} quit 离开全屏的回调
   */
  screenChange(enter, quit) {
    if (!this.isFullscreenData) return;
    const methodName = `on${this.prefixName}fullscreenchange`;
    document[methodName] = e => {
      if (this.isElementFullScreen()) {
        enter && enter(e); // 进入全屏回调
      } else {
        quit && quit(e); // 离开全屏的回调
      }
    };
  }
  /**
   * @description: 浏览器无法进入全屏时触发,可能是技术原因,也可能是用户拒绝:比如全屏请求不是在事件处理函数中调用,会在这里拦截到错误
   * @param {Function} enterErrorFn 回调
   */
  screenError(enterErrorFn) {
    const methodName = `on${this.prefixName}fullscreenerror`;
    document[methodName] = e => {
      enterErrorFn && enterErrorFn(e);
    };
  }
  /**
   * @description: 是否支持全屏+判断浏览器前缀
   * @param {Function} fn 不支持全屏的回调函数 这里设了一个默认值
   */
  isFullscreen(fn) {
    let fullscreenEnabled;
    // 判断浏览器前缀
    if (document.fullscreenEnabled) {
      fullscreenEnabled = document.fullscreenEnabled;
    } else if (document.webkitFullscreenEnabled) {
      fullscreenEnabled = document.webkitFullscreenEnabled;
      this.prefixName = "webkit";
    } else if (document.mozFullScreenEnabled) {
      fullscreenEnabled = document.mozFullScreenEnabled;
      this.prefixName = "moz";
    } else if (document.msFullscreenEnabled) {
      fullscreenEnabled = document.msFullscreenEnabled;
      this.prefixName = "ms";
    }
    if (!fullscreenEnabled) {
      this.isFullscreenData = false;
      fn && fn(); // 执行不支持全屏的回调
    }
  }
  /**
   * @description: 检测有没有元素处于全屏状态
   * @return 布尔值
   */
  isElementFullScreen() {
    const fullscreenElement =
      document.fullscreenElement ||
      document.msFullscreenElement ||
      document.mozFullScreenElement ||
      document.webkitFullscreenElement;
    if (fullscreenElement === null) {
      return false; // 当前没有元素在全屏状态
    } else {
      return true; // 有元素在全屏状态
    }
  }
}
let full = new fullScreen(() => {
  console.log("不支持");
});
full.screenError(e => {
  console.log("进去全屏失败:", e);
});
// 全屏请求必须在事件处理函数中调用,否则将会被拒绝。
full.Fullscreen(".left"); // 触发进去全屏失败回调
const obj = {
  enter: e => {
    // 如果退出全屏 退出的还是全屏状态,将会触发进入全屏的回调,这种情况比较少 注意一下
    console.log("进入全屏", e);
  },
  quit: e => {
    console.log("退出全屏", e);
    // 通常不会出现嵌套的情况
  }
};
full.screenChange(obj.enter, obj.quit);
function leftScreen() {
  full.Fullscreen(".left");
}
function rightScreen() {
  full.Fullscreen(".right");
}
function redScreen() {
  full.Fullscreen(".left-son");
}
// 退出全屏 退出到上次的状态
function exitScreen() {
  full.exitFullscreen();
}

            
          
!
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