Document.hidden

Document.hidden （只读属性）返回布尔值，表示页面是（true）否（false）隐藏。

例子

var hidden, visibilityChange;
if (typeof document.hidden !== "undefined") {
  hidden = "hidden";
  visibilityChange = "visibilitychange";
} else if (typeof document.mozHidden !== "undefined") {
  hidden = "mozHidden";
  visibilityChange = "mozvisibilitychange";
} else if (typeof document.msHidden !== "undefined") {
  hidden = "msHidden";
  visibilityChange = "msvisibilitychange";
} else if (typeof document.webkitHidden !== "undefined") {
  hidden = "webkitHidden";
  visibilityChange = "webkitvisibilitychange";
}
  // 添加监听器
document.addEventListener(visibilityChange, function () {
  console.log("当前页面是否被隐藏：" + document[hidden]);
}, false);