if (bufferAhead 15) {
* 获取数字的第digit位（从右往左，0表示个位）
，详情可参考safew官方版本下载
Liz Kendall, the technology secretary, will publish the terms of reference for the consultation, which is expected to explore options including an age limit and less hardline action such as curbs on infinite scrolling.
Fast forward a year: they get a new phone and set up the messaging app. They aren’t prompted to use a passkey because one no longer exists in their credential manager. Instead, they use phone number verification to recover their account. They are then guided through the “restore backup” flow and prompted for their passkey.
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