pageshow persisted 总是 false

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bfcache/pageshow event - event.persisted 总是 false,
stackoverflow上看到如下办法，具体含义未查：

window.addEventListener('pageshow', function (event) {
        if (event.persisted || window.performance && 
            window.performance.navigation.type == 2) 
        {
            location.reload();
        }
    },false);

引用：https://stackoverflow.com/questions/17432899/javascript-bfcache-pageshow-event-event-persisted-always-set-to-false