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Programmatically change the src of an img tag
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64
You can use both jquery and javascript method:
if you have two images for example:
<img cla...
PostgreSQL error 'Could not connect to server: No such file or directory'
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From brew info postgres: ARCHFLAGS="-arch x86_64" gem install pg
– wrdevos
May 27 '13 at 14:52
1
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Overflow:hidden dots at the end
... I can use my common sense to tell that this answer is "right" based on the votes and comments. However, I fail to see in reality how this answer is "right". I used both overflow: hidden; and text-overflow: ellipsis; in a <p> element (i.e., a block element) and found no ... at the ...
Comparing mongoose _id and strings
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64
ObjectIDs are objects so if you just compare them with == you're comparing their references. I...
Where can I set environment variables that crontab will use?
...environment -- not done by cron (usually switches HOME)
. $HOME/.cronfile
base=`basename $0`
cmd=${REAL_HOME:-/real/home}/bin/$base
if [ ! -x $cmd ]
then cmd=${HOME}/bin/$base
fi
exec $cmd ${@:+"$@"}
(Written using an older coding standard - nowadays, I'd use a shebang '#!' at the start.)
The ...
Naming “class” and “id” HTML attributes - dashes vs. underlines [closed]
...ding and scannability.
/* Not recommended: does not separate the words “demo” and “image” */
.demoimage {}
/* Not recommended: uses underscore instead of hyphen */
.error_status {}
/* Recommended */
#video-id {}
.ads-sample {}
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...块注释
--]]
变量
Lua的数字只有double型，64bits，你不必担心Lua处理浮点数会慢（除非大于100,000,000,000,000），或是会有精度问题。
你可以以如下的方式表示数字，0x开头的16进制和C是很像的。
1
2
3
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Lambda capture as const reference?
...t;(best_string)](const string& s)
{
best_string = s; // fails
};
DEMO
In c++17 using std::as_const:
[&best_string = std::as_const(best_string)](const string& s)
{
best_string = s; // fails
};
DEMO 2
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Vertically centering a div inside another div [duplicate]
...%;
transform: translate(-50%,-50%);
width: 200px;
height: 200px;
}
Demo
♥ my favourite modern solution (flexbox)
I started to use flexbox more and more its also well supported now Its by far the easiest way.
CSS
.cn {
display: flex;
justify-content: center;
align-items: center...
How to find the size of localStorage
...ngth*16)/(8*1024)) + ' KB' : 'Empty (0 KB)';
};
Mine returned: "30.896484375 KB"
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