(function () {
var t
var hiddenProperty = 'hidden' in document ? 'hidden' :
'webkitHidden' in document ? 'webkitHidden' :
'mozHidden' in document ? 'mozHidden' :
null;
var visibilityChangeEvent = hiddenProperty.replace(/hidden/i, 'visibilitychange');
var onVisibilityChange = function () {
document.title = ''
if (!document[hiddenProperty]) {
var arr = '喜欢这个效果就收藏吧'
console.log(arr.length)
var index = 0
t = setInterval(() => {
if (index > arr.length) {
index = 0;
document.title = ' '
}
var oldTitle = index === 0 ? '' : document.title.slice(0, document.title.length - 1)
document.title = oldTitle + arr.slice(index, index + 1) + '_'
index++
}, 300);
} else {
console.log(t)
if (t) {
console.log('clear')
clearInterval(t)
}
document.title = '快看，又出bug了'
}
}
document.addEventListener(visibilityChangeEvent, onVisibilityChange);
})(window)
