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macos - What is the encoding mechanism of files?

For example, I have an f.txt file on my mac. The system is utf-8 encoded and contains the data "\xE6\x97\A5" - which is the Chinese character "日" in utf-8 encoding. Then I use ultraedit to edit f.txt Save as the following files: The actual stored content of the f1.txt file is &qu...

怪我咯 2017-05-16 16:37:24

vim - A problem using regular expressions for text processing with vi/shell

The requirements are as follows: The input file input.txt: a1 a2 a3 a4 b1 b2 a5 b3 b4 b5 The output file output.txt is required to be: a1 a4 b1 b2 a5 b3 b5 That is, the Nth line is removed, and the conditions satisfied by N are: the Nth line and The first letters of lines N-1 and N+1 are the same (t...

黄舟 2017-05-16 16:42:06

javascript - checkbox condition

{Code...} The above is the condition I wrote. If a1 is checked, a2~5 will be locked. If one of a2~a5 is checked, a1 will be locked. I want to add another condition, but I still can’t figure it out. It is assuming that there is something in a2~5. If one is checked (or two, three, or four are all chec...

習慣沉默 2017-05-19 10:47:09