我正在尝试在用户关闭浏览器时保存一些统计数据，以下是代码：
if (typeof document.hidden !== 'undefined') { // Opera 12.10 and Firefox 18 and later support
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';
} else {
console.log('in else condition');
}
if (typeof document.addEventListener === 'undefined' || hidden === undefined) {
console.log("App requires a browser, such as Google Chrome or Firefox, that supports the Page Visibility API.");
} else {
document.addEventListener(visibilityChange, handleVisibilityChange, false);
}
function handleVisibilityChange() {
// Send a ajax call with **async: false**
}
以上代码在Mozilla Firefox和Google Chrome中运行良好，但在Safari中无法正常工作。我正在Mac OS上进行测试，Safari版本为Version 12.1.1 (14607.2.6.1.1)
请问是否有人能建议这是否是Safari中的预期行为，并且有什么解决方法。
谢谢。