Leeiio Chaos Made.The world is golden.HomeAboutArchiveStudio+ArticlesiMessage 显示“尚未送达”但是对方已经收到信息？iMessage Not Delivered but Read?To fix this issue, open iMessage on you Mac and then click “Preferences – Accounts – Accounts Details… – Sign Out – Sign In again”. If it still not work,sign out all of iMessages on your devices. 这个问题困扰我好几天了，中文果然搜不到什么东西，用英文一搜就搜出了解决方案。iMessage 显示“尚未送达”但是实际上对方已经收到信息，有时候刚开始正常显示“已送达”，过了一小会马上出现红色感叹号提示“尚未送达”了，还有时候“已读”和“尚未送达”两种状态同时显示在一条信息后面，这个时候，只需要登出电脑端的 iMessage 账户然后重新登录就可以了这个还“真”是个 Beta 版本。iMessagePosted in Life | 生活@ 7 years, 4 months ago|16 CommentsArticles歌に形はないけれど　ピアノｖｅｒ.ありがとう！私はこのギフトを好む！birthday MusicPosted in Life | 生活@ 7 years, 5 months ago|3 CommentsQuotes为什么 CSS 选择器是从右往左的？很多人可能都知道了 CSS 的选择器浏览器在解析的时候是从右往左的，和你所熟悉的从左往右的规则是不同的。但是这是为什么呢？这么做的性能是否更高？Related Items:为什么排版引擎解析 CSS 选择器时一定要从右往左解析？Keep in mind that when a browser is doing selector matching it has one element (the one it's trying to determine style for) and all your rules and their selectors and it needs to find which rules match the element. This is different from the usual jQuery thing, say, where you only have one selector and you need to find all the elements that match that selector.If you only had one selector and only one element to compare against that selector, then left-to-right makes more sense in some cases. But that's decidedly not the browser's situation. The browser is trying to render Gmail or whatever and has the one  it's trying to style and the 10,000+ rules Gmail puts in its stylesheet (I'm not making that number up).In particular, in the situation the browser is looking at most of the selectors it's considering don't match the element in question. So the problem becomes one of deciding that a selector doesn't match as fast as possible; if that requires a bit of extra work in the cases that do match you still win due to all the work you save in the cases that don't match.If you start by just matching the rightmost part of the selector against your element, then chances are it won't match and you're done. If it does match, you have to do more work, but only proportional to your tree depth, which is not that big in most cases.On the other hand, if you start by matching the leftmost part of the selector... what do you match it against? You have to start walking the DOM, looking for nodes that might match it. Just discovering that there's nothing matching that leftmost part might take a while.So browsers match from the right; it gives an obvious starting point and lets you get rid of most of the candidate selectors very quickly. You can see some data at http://groups.google.com/group/mozilla.dev.tech.layout/browse_thread/thread/b185e455a0b3562a/7db34de545c17665 (though the notation is confusing), but the upshot is that for Gmail in particular two years ago, for 70% of the (rule, element) pairs you could decide that the rule does not match after just examining the tag/class/id parts of the rightmost selector for