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Why does my application spend 24% of its life doing a null check?
...t store a copy of the bytes in RAM. An important one is the L1 cache, typically 16 kilobytes for data and 16 kilobytes for instructions. Small, allowing it to be close to the execution engine. Reading bytes from the L1 cache typically takes 2 or 3 CPU cycles. Next up is the L2 cache, bigger and slow...
Why does Double.NaN==Double.NaN return false?
...enormalized value or a signed zero, and an operation that has no mathematically definite result produces NaN. All numeric operations with NaN as an operand produce NaN as a result. As has already been described, NaN is unordered, so a numeric comparison operation involving one or two NaNs returns fa...
Mac OS X 入门操作常见问题集锦(持续更新) - 更多技术 - 清泛网 - 专注C/...
Mac OS X 入门操作常见问题集锦(持续更新)如何截图:shift + command + 3 截整屏shift + command + 4 截窗口(默认png,并保存到桌面)shift + command + Ctrl + 4 如何截图:
shift + command + 3 截整屏
shift + command + 4 截窗口(默认png,并保存...
Discuz与phpsso整合时无法同步登录:通过js load 另一个 script 文件导致的...
...t;/' + 'script>');复制代码通常来说用这个方法是没有什么问题的,但是最近在帮人分析整合 phpcms 与 discuzx 同步登录时,发现在 discuzx 登录后无论如何也没能让 phpcms 同步登录。原因是 dz 的登录采用的是 ajax 方式,ucenter 返回的...
Android中Java和JavaScript交互 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ChromeClient() {});
Uncaught ReferenceError: functionName is not defined
问题出现原因,网页的js代码没有加载完成,就调用了js方法。解决方法是在网页加载完成之后调用js方法:
myWebView.setWebViewClient(new WebViewClient() {
@Override
public void o...
Most efficient T-SQL way to pad a varchar on the left to a certain length?
...ecause you are dealing with a fixed length).
But as I said you should really avoid doing this in your database.
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window+nginx+php-cgi的php-cgi线程/子进程问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
window+nginx+php-cgi的php-cgi线程/子进程问题见bbshttp: bbs csdn net topics 390803643 close正常的配置情况下,window的php-cgi是不会出现多线程 子进程的,例如以下配置fastcgi_pass 见bbs
http://bbs.csdn.net/topics/390803643/close
正常的配置情况下,window...
家政O2O百家争鸣后的卡位战:烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示,今年或将迎来真正的家政O2O大战,那么问题来了,怎么战?融资后的钱是否仅有补贴一道?
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注,根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战:烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示,今年或将迎来真正的家政O2O大战,那么问题来了,怎么战?融资后的钱是否仅有补贴一道?
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注,根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战:烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示,今年或将迎来真正的家政O2O大战,那么问题来了,怎么战?融资后的钱是否仅有补贴一道?
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注,根据“云家政”去年年底发布的北上广深四地家...
