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What is the difference between synchronous and asynchronous programming (in node.js)
...perations are not doing very heavy lifting like querying huge data from DB then go ahead with Synchronous way otherwise Asynchronous way.
In Asynchronous way you can show some Progress indicator to the user while in background you can continue with your heavy weight works. This is an ideal scenario ...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...须加空格，不能写成if [$foo -eq 0]
if else
if
if condition
then
command1
command2
...
commandN
fi
写成一行（适用于终端命令提示符）：
if `ps -ef | grep ssh`; then echo hello; fi
末尾的fi就是if倒过来拼写，后面还会遇到类似...
Sending Arguments To Background Worker?
...123;
bgw1.RunWorkerAsync(argument: value); // the int will be boxed
and then
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
int value = (int) e.Argument; // the 'argument' parameter resurfaces here
...
// and to transport a result back to the main thread
double ...
Draw Circle using css alone [duplicate]
...ular in shape. (note: no prefix has been required for a long time)
You can then play around with background-color / gradients / (even pseudo elements) to create something like this:
.red {
background-color: red;
}
.green {
background-color: green;
}
.blue {
background-color: blue;...
How to run SQL script in MySQL?
... < path/to/test.sql
Install the MySQL GUI tools and open your SQL file, then execute it
Use phpmysql if the database is available via your webserver
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Git “error: The branch 'x' is not fully merged”
...ver) from the branch,
what I did in my code is that I switched to master, then merge the branch into it (to make sure they're identical on your local machine), then I switched to the branch again and pushed the updates or changes into the remote online repo using "git push".
after that, I switched...
How to execute mongo commands through shell scripts?
...
Put your mongo script into a .js file.
Then execute mongo < yourFile.js
Ex:
demo.js //file has your script
use sample //db name
show collections
keep this file in "c:\db-scripts"
Then in cmd prompt go to "c:\db-scripts"
C:\db-scripts>mongo < demo...
Split string with multiple delimiters in Python [duplicate]
...
Do a str.replace('; ', ', ') and then a str.split(', ')
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Access event to call preventdefault from custom function originating from onclick attribute of tag
...s is and notice that the link does no redirect to Google after the alert.
Then, change the event passed into the onclick handler to something else like e, click run, then notice that the redirection does take place after the alert (the result pane goes white, demonstrating a redirect).
...
Access Container View Controller from Parent iOS
...r (such as alertview_embed), using the Attributes inspector in Storyboard. Then have the parent view controller (the one housing the container view) implement a method like this:
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSString * segueName = segue.identifier;
i...