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数据结构与本地数据库 07：错题记录、事务与统计图 · App Inventor 2 中文网
...编号 = SQLite1.SelectSQL("SELECT v FROM meta WHERE k=?",list("next_id"))
if length(已存编号) > 0 { 下个ID = max(下个ID, 已存编号[1] * 1) }
foreach 行 in 行们 {
listadd(卡片, makedict(pair("id", 行[1]), pair("question", 行[2]), pair("answer", 行[3]), pair("category", 行[4]), pa...
How do I list one filename per output line in Linux?
...1. GNU coreutils (installed on standard Linux systems) and Solaris do; but if in doubt, use man ls or ls --help or check the documentation. E.g.:
$ man ls
...
-1 list one file per line. Avoid '\n' with -q or -b
...
How does BLAS get such extreme performance?
...evel1 functions. However, you can boost the performance of this functions if you can provide a dedicated implementation that makes use of some multiprocessor architecture with shared memory.
Level 3 functions are operations like the matrix-matrix product. Again you could implement them in terms o...
How to count items in JSON object using command line?
...
If your root is not an array but an object with a key that contains an array, i.e. { "key": [elem1, elem2] } , then you can use use jq '.[] | length' file.json
– bitek
Jan 27 '15 at 15:1...
Get a list of all the files in a directory (recursive)
...
weird..this gives the root path even if i preface it with a . It goes /./path
– light24bulbs
Jul 23 '18 at 15:05
...
how to hide a vertical scroll bar when not needed
...customized the scrollbar using -webkit-scrollbar psuedo element. ? because if overflow is auto psuedo elements arent working.... I want to customize my scrollbar as well as hide then when not needed ?
– Kpatel1989
Apr 27 '15 at 8:37
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How do I get rid of “[some event] never used” compiler warnings in Visual Studio?
...picious...
There's also an interesting article about this warning and specifically how it applies to interfaces; there's a good suggestion on how to deal with "unused" events. The important parts are:
The right answer is to be explicit about what you expect from the event, which in this case, i...
How do I determine scrollHeight?
... Note this only returns the scrollHeight of the "first" element found and if any elements are currently "hidden" you might get a zero here even if others do have a positive scrollHeight, FWIW :)
– rogerdpack
Oct 21 '17 at 6:06
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Disable vertical scroll bar on div overflow: auto
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If you want to accomplish the same in Gecko (NS6+, Mozilla, etc) and IE4+ simultaneously, I believe this should do the trick:V
body {
overflow: -moz-scrollbars-vertical;
overflow-x: hidden;
overflow-y: auto;
}
This will be...
How do I resolve a HTTP 414 “Request URI too long” error?
...equestLine. Change this value to something larger than its default of 8190 if you want to support a longer request URI. The value is in /etc/apache2/apache2.conf. If not, add a new line (LimitRequestLine 10000) under AccessFileName .htaccess.
However, note that if you're actually running into this...