js之一些方法

发表于

Element.requestFullscreen() 方法用于发出异步请求使元素进入全屏模式。

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let elem = this._element.nativeElement.querySelector('.demo-content');
    if (elem.requestFullscreen) {
      elem.requestFullscreen();
    } else if (elem.webkitRequestFullScreen) {
      elem.webkitRequestFullScreen();
    } else if (elem.mozRequestFullScreen) {
      elem.mozRequestFullScreen();
    } else if (elem.msRequestFullScreen) {
      elem.msRequestFullScreen();
    }

window.onbeforeunload 在即将离开当前页面（刷新或关闭）时触发

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window.onbeforeunload = function(event) {
  event.returnValue = "我在这写点东西...";
};