var hidden, state, visibilityChange;
if ( typeof document.hidden !==  "undefined" ) {hidden =  "hidden" ;visibilityChange =  "visibilitychange" ;state =  "visibilityState" ;
}  else if ( typeof document.mozHidden !==  "undefined" ) {hidden =  "mozHidden" ;visibilityChange =  "mozvisibilitychange" ;state =  "mozVisibilityState" ;
}  else if ( typeof document.msHidden !==  "undefined" ) {hidden =  "msHidden" ;visibilityChange =  "msvisibilitychange" ;state =  "msVisibilityState" ;
}  else if ( typeof document.webkitHidden !==  "undefined" ) {hidden =  "webkitHidden" ;visibilityChange =  "webkitvisibilitychange" ;state =  "webkitVisibilityState" ;
// 添加监听器,监听当前是否活动页面
document.addEventListener(visibilityChange,  function () {document.title = document[state];
},  false );
Original: https://www.cnblogs.com/waw/p/16210613.html
Author: 狼人:-)
Title: js判断当前页面是否活动页面
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