IOS下的safari不支持localStorage？

同事在统计日志的时候，想用localStorag去记载一些什么，但是在各大浏览器都运行的良好的基础上，唯独IOS下的safari一直静静无声，没有任何反应。打印localStorage都是Object，说明浏览器是支持的，后来发现猜想可能是无痕浏览等设置方面的问题。

关闭无痕浏览模式后，数据正常。

// Safari, in Private Browsing Mode, looks like it supports localStorage but all calls to setItem
// throw QuotaExceededError. We're going to detect this and just silently drop any calls to setItem
// to avoid the entire page breaking, without having to do a check at each usage of Storage.
if (typeof localStorage === 'object') {
    try {
        localStorage.setItem('localStorage', 1);
        localStorage.removeItem('localStorage');
    } catch (e) {
        Storage.prototype._setItem = Storage.prototype.setItem;
        Storage.prototype.setItem = function() {};
        alert('Your web browser does not support storing settings locally. In Safari, the most common cause of this is using "Private Browsing Mode". Some settings may not save or some features may not work properly for you.');
    }
}

可以这样判断。提示用户关闭无痕模式。