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转型产品经理必看 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...多人问我如何转型做产品经理、转型产品经理会遇到哪些问题,其实我一直没能回答好这个问题,因为我从运营转型产品经理的过程太顺利,并且转型的过程也没有做太多的思考和总结。直到看到这篇文章...作者完整记录了自己...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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磁盘消耗对比:
选择MongoDB就必然会面对磁盘消耗的问题。我们拿到的数据大概是这样的:每天的数据量不到200万条,平均数据的大小不超过4k,但MongoDB存一个月的数据就需要接近40G,最近三个月的数据则需要接近100G。限...
How does Facebook Sharer select Images and other metadata when sharing my URL?
...of 3:1, and in PNG, JPEG or GIF format.
Can I specify multiple images to allow the user to select an image?
Yes, you just need to add multiple image meta tags in the order you want them to appear in. The user will then be presented with an image selector dialog:
I specified the appropriate imag...
How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
...;
Proof of concept here: https://dtbaker.net/files/prevent-post-resubmit.php
I would still recommend a Post/Redirect/Get approach, but this is a novel JS solution.
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Replacing Spaces with Underscores
I have a PHP Script that users will enter a name like: Alex_Newton ,
12 Answers
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“Adobe Flash Player因过期而遭到阻止”的内幕起因和解决办法 - 更多技术 ...
...情况。随后我尝试电脑里第二浏览器maxthon时并未出现此问题,此时,我大概猜到是怎么回事了……
◆起因
大家先听我慢慢道来,这跟前不久我们跟踪报道的Hacking Team(以下简称HT)400GB内部资料泄露事件有莫大联系。如果说...
Memcached下一站:HandlerSocket! - 更多技术 - 清泛网 - 专注C/C++及内核技术
...形中让Memcached成为故障的根源:
Memcached数据一致性的问题:当MySQL数据变化后,如果不能及时有效的清理掉过期的数据,就会造成数据不一致。这在强调即时性的Web2.0时代,不可取。
Memcached崩溃后的雪崩效应:作为缓存的Memc...
How to round up a number to nearest 10?
...$input / 10) * 10;
Edit: I've been doing it this way for so long.. but TallGreenTree's answer is cleaner.
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What is the best regular expression to check if a string is a valid URL?
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I wrote my URL (actually IRI, internationalized) pattern to comply with RFC 3987 (http://www.faqs.org/rfcs/rfc3987.html). These are in PCRE syntax.
For absolute IRIs (internationalized):
/^[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]...
AsyncProcedures异步过程扩展 · App Inventor 2 中文网
...数据处理
示例2:文件操作
常见问题
Q: 异步过程中如何更新UI?
Q: 如何处理异步过程的错误?
Q: 异步过程会阻塞应用吗?
Q: 如何控制异步过程的执行顺序?
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