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搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...！
[initandlisten] db version v2.4.6
……..
[initandlisten] waiting for connections on port 27017
[websvr] admin web console waiting for connections on port 28017
mongodb默认自带提供了web访问接口，通过 IP + 端口的形式可以访问。
http://192.168.0.1:28017/
二、主...
Determining whether jQuery has not found any element
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$('#idThatDoesnotexist').length is what you're looking for. (If it finds nothing, this will === 0.) So your conditional statement should probably be:
if($('#id').length) { /* code if found */ } else { /* code if not found */ }
You're getting an object returned from that alert b...
Numbering rows within groups in a data frame
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For making this r-faq question more complete, a base R alternative with sequence and rle:
df$num <- sequence(rle(df$cat)$lengths)
which gives the intended result:
> df
cat val num
4 aaa 0.05638315 1
2 ...
How to get key names from JSON using jq
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You need to use jq 'keys[]'. For example:
echo '{"example1" : 1, "example2" : 2, "example3" : 3}' | jq 'keys[]'
Will output a line separated list:
"example1"
"example2"
"example3"
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AngularJS - How to use $routeParams in generating the templateUrl?
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The problem why the former does not work is documented groups.google.com/forum/?fromgroups=#!topic/angular/qNi5lqm-Ps8. As injection targets to config() only providers are passed, not actual service instances such as $routePrams.
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How can prepared statements protect from SQL injection attacks?
...part.
So, once we have to add, say, a dynamical identifier - a field name, for example - prepared statements can't help us. I've explained the matter recently, so I won't repeat myself.
share
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imp...
CSS - How to Style a Selected Radio Buttons Label?
...ype="radio" id="radio1" name="radios" value="all" checked>
<label for="radio1">All</label>
<input type="radio" id="radio2" name="radios" value="false">
<label for="radio2">Open</label>
<input type="radio" id="radio3" name="radios" value="true">
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Django: Set foreign key using integer?
Is there a way to set foreign key relationship using the integer id of a model? This would be for optimization purposes.
2...
New line in text area
...hought macOS, being Unix-based, would still have that issue. But you’re for sure right, the difference is more general.
– SeizeTheDay
Sep 3 '19 at 14:34
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CSS: Change image src on img:hover
...ehaviour. Sometimes it's important to have image element on the page, e.g. for accessibility requirements, but then it's better to show/hide two image elements with css. In most cases it's a bad idea to change image's src attribute with JS, try to use background-image if you can.
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