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// 不同环境兼容
let hidden = ''
let visibilityChange = ''
if (typeof document.hidden !== 'undefined') { // Opera 12.10 and Firefox 18 and later support
hidden = 'hidden'
visibilityChange = 'visibilitychange'
} else if (typeof document.msHidden !== 'undefined') {
hidden = 'msHidden'
visibilityChange = 'msvisibilitychange'
} else if (typeof document.webkitHidden !== 'undefined') {
hidden = 'webkitHidden'
visibilityChange = 'webkitvisibilitychange'
}
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