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MediaHelper 媒体助手扩展：从媒体文件提取元数据和专辑封面 · App Inventor 2 中文网
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已有内置组件：读取媒体信...
Should I choose ActivePerl or Strawberry Perl for Windows? [duplicate]
...reated for Windows and so some CPAN modules will not work (because they do Unix-specific things).
I have used both before and it seemed to work for most cases. But I lean towards Strawberry Perl because the environment is closer to Unix and so there are not many incompatibilities. On the other hand...
How do you get a timestamp in JavaScript?
... be sure I always use the seconds, not milliseconds.
This will give you a Unix timestamp (in seconds):
var unix = Math.round(+new Date()/1000);
This will give you the milliseconds since the epoch (not Unix timestamp):
var milliseconds = new Date().getTime();
...
Difference between sh and bash
...descendant of the Korn shell. FreeBSD's sh is a descendant of the original UNIX Bourne shell. Solaris has its own sh which for a long time was not POSIX-compliant; a free implementation is available from the Heirloom project.
How can you find out what /bin/sh points to on your system?
The compli...
Linux: copy and create destination dir if it does not exist
...ctory.
Note that $_ is not part of the POSIX standard, so theoretically a Unix variant might have a shell that doesn't support this construct. However, I don't know of any modern shells that don't support $_; certainly Bash, Dash, and zsh all do.
A final note: the command I've given at the start...
VIM Disable Automatic Newline At End Of File
...ding the last newline character, or possibly there is a mixup with windows/unix line ending types (\n or \r\n, etc).
Update:
An alternative solution might be to just add this line to your .vimrc:
set fileformats+=dos
sha...
社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...不抓取？
1、有些网站利用js生成网页内容，直接查看源代码是一堆js。 可以使用mozilla、webkit等可以解析浏览器的工具包解析js、ajax，不过速度会有点慢。
2、网页里有一些css隐藏的文字。使用工具包把css隐藏文字去掉。
3、...
What is your most productive shortcut with Vim?
...nes which DON'T contain the string "bar."
It's interesting that the common Unix command grep was actually inspired by this ex command (and is named after the way in which it was documented). The ex command :g/re/p (grep) was the way they documented how to "globally" "print" lines containing a "regu...
What's the difference between UTF-8 and UTF-8 without BOM?
...TF-8 files with BOM, so it's clearly possible. I think maybe you meant the Unix-land cat won't give you a clean result, a result that has BOM only at the start. If you meant that, then that's because cat works at the byte level, not at the interpreted contents level, and in similar fashion cat can't...
App Inventor 2 矩阵块 · App Inventor 2 中文网
...角是第 1 行第 1 列，不是第 0 行第 0 列。写惯了从 0 数的代码，这里最容易踩坑。
索引个数 = 维度数：2 维矩阵取一个单元格，要给”行、列”两个索引；三维矩阵给三个。
矩阵是纯数值的：单元格里只能放数字。想把文本...