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译文：理解Java中的弱引用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...方面的专家，但是我认为至少你应该了解什么是弱引用，如何使用它们，并且什么场景使用。既然它们是一些不知名的概念，我简单就着前面的三个问题来说明一下。
强引用(Strong Reference)
强引用就是我们经常使用的引用，其...
process.env.NODE_ENV is undefined
...d will also make sure it works across different platforms.
In the project root, run:
npm install cross-env
Then in your package.json, under scripts, add:
"start": "cross-env NODE_ENV=dev node your-app-name.js"
Then in your terminal, at the project root, start your app by running:
npm start
...
Getting Chrome to accept self-signed localhost certificate
...after adding the certificate to the system certificate store under Trusted Roots. Even though the certificate is listed as correctly installed when I click "View certificate information" in Chrome's HTTPS popup, it still insists the certificate cannot be trusted.
...
Using an SSH keyfile with Fabric
...2] No such file or directory: ' /path/to/.ssh/key' or Login password for ' root': just make sure you have no whitespaces in your .ssh/config. It's for example User=root instead of User = root...
– dennis
Dec 13 '13 at 12:39
...
Run a Docker image as a container
... If you need to add an environment variable you can do docker run -i -t -e ROOT_PASSWORD=root ubuntu:12.04
– Balaji Radhakrishnan
Dec 16 '17 at 14:23
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How do I initialize a TypeScript object with a JSON object
...
TLDR: TypedJSON (working proof of concept)
The root of the complexity of this problem is that we need to deserialize JSON at runtime using type information that only exists at compile time. This requires that type-information is somehow made available at runtime.
Fortuna...
How to change position of Toast in Android?
...Height();
if (v.getGlobalVisibleRect(gvr))
{
View root = v.getRootView();
int halfWidth = root.getRight() / 2;
int halfHeight = root.getBottom() / 2;
int parentCenterX = ((gvr.right - gvr.left) / 2) + gvr.left;
int parentCenterY = ((gvr.bot...
30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...公路下山时坏在半路上了。于是两位工程师和一位经理就如何修车的问题 展开了讨论。
硬件工程师说：“我可以用随身携带的瑞士军刀把车坏的部分拆下来，找出原因，排除故障。”
项目经理说：“根据经营管理学，应该召...
More elegant “ps aux | grep -v grep”
...)
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1902 0.0 0.1 82560 3580 ? Ss Oct20 0:00 /usr/sbin/sshd -D
$ ps up $(pgrep -f sshddd)
error: list of process IDs must follow p
[stderr output truncated]
$ ps up $(pgrep -f sshddd) 2>&-
[no out...
SSL certificate rejected trying to access GitHub over HTTPS behind firewall
...e in cygwin (thanks dirkjot)
There are two solutions:
Actually install root certificates. Curl guys extracted for you certificates from Mozilla.
cacert.pem file is what you are looking for. This file contains > 250 CA certs (don't know how to trust this number of ppl). You need to download ...