want to know how the effect in the picture is realized
description: when you open this page, title is changed to "you found it" and reverts to the real title after a few seconds. Modify title, again when you leave this page. What method is used to monitor page switching
page address
determine whether the browser has gained or lost focus, and then dynamically modify title
window.onfocus = function () {
document.title = "';
};
window.onblur = function () {
document.title = "';
};//
function browser_status(action) {
//
let hidden, state, visibilityChange,status
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"
}
// title
document.addEventListener(visibilityChange, function() {
status = document[state]
if (document[state] == 'hidden') {
document.title = "'
} else {
document.title = "'
}
}, false)
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