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check if jquery has been loaded, then load it if false

... I believe appending a script tag to body works in all browsers. – Steven Lu Jan 6 '13 at 21:26 3 ...
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Link to “pin it” on pinterest without generating a button

... or hundreds of posts, each one with social buttons. I just can't generate all the buttons for each url: it is too slow (facebook, g+, twitter, pinterest... for hundreds of links). So, instead of the facebook share button to be generated on the fly, I use a simple img pointing to ...
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Download File to server from URL

Well, this one seems quite simple, and it is. All you have to do to download a file to your server is: 10 Answers ...
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C语言面试那些事儿──一道指针与数组问题 - c++1y / stl - 清泛IT社区,为创新赋能!

...言指针较晦涩和难懂的地方。 理解了这两点的话,上述问题则十分简单:a + 1:现在把a看作一个指针,指针+1操作,根据C语言语义,实际增加偏移量的是指针指向类型的长度,即32位机器下的int型,即4字节,故a+1就是&a[1],...
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大数据不是万能的 - 资讯 - 清泛网 - 专注C/C++及内核技术

...地方。我们认为,大数据其实面对的不是99%的机构面对的问题,这个说法跟市场上很多的说法不大一样。 我们看一下,把这个额度分配到一万到十万区域。在这个领域从事信贷服务的,大家马上想到的是信用卡,也可能想到某...
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Which MySQL datatype to use for an IP address? [duplicate]

...Pv6 addresses you could use a BINARY instead: `ipv6` BINARY(16) And use PHP’s inet_pton and inet_ntop for conversion: 'INSERT INTO `table` (`ipv6`) VALUES ("'.mysqli_real_escape_string(inet_pton('2001:4860:a005::68')).'")' 'SELECT `ipv6` FROM `table`' $ipv6 = inet_pton($row['ipv6']); ...
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How to convert array to SimpleXML

...ent('<?xml version="1.0"?><data></data>'); // function call to convert array to xml array_to_xml($data,$xml_data); //saving generated xml file; $result = $xml_data->asXML('/file/path/name.xml'); ?> Documentation on SimpleXMLElement::asXML used in this snippet ...
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一文讲透区块链技术原理 - 资讯 - 清泛网 - 专注C/C++及内核技术

...定是可信的。 区块链技术原理的来源可归纳为一个数学问题:拜占庭将军问题。拜占庭将军问题延伸到互联网生活中来,其内涵可概括为:在互联网大背景下,当需要与不熟悉的对手方进行价值交换活动时,人们如何才能防止...
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闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...新连接,其它的Worker会重新进入休眠状态,这就是「惊群问题」。 Nginx缺省激活了accept_mutex,也就是说不会有惊群问题,但真的有那么严重么?实际上Nginx作者Igor Sysoev曾经给过相关的解释: OS may wake all processes waiting on accept(...
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MySQL ('root'@'%') does not exist 的问题 - 爬虫/数据库 - 清泛IT社区,为创新赋能!

MySQL ('root'@'%') does not exist的问题: 在使用mysql时出现问题: The user specified as a definer ('root'@'%') does not exist。 一般是由于root用户对全局host无访问权限。因此只要给root用户添加一个访问权限即可。 解决办法: 登陆mysql ,...