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Use dynamic (variable) string as regex pattern in JavaScript
...this is #abc# some #abc# stuff.";
var output = input.replace(regex, "!!");
alert(output); // Hello this is !! some !! stuff.
JSFiddle demo here.
In the general case, escape the string before using as regex:
Not every string is a valid regex, though: there are some speciall characters, like ( or [....
How to rename a file using Python
...
Use os.rename:
import os
os.rename('a.txt', 'b.kml')
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How to install trusted CA certificate on Android device?
...source code, add your cert, then build cacerts.bks using the certimport.sh script. android.git.kernel.org/?p=platform/libcore.git;a=tree;f=luni/….
– Mark Berry
Dec 22 '10 at 17:11
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Maximum Java heap size of a 32-bit JVM on a 64-bit OS
The question is not about the maximum heap size on a 32-bit OS, given that 32-bit OSes have a maximum addressable memory size of 4GB, and that the JVM's max heap size depends on how much contiguous free memory can be reserved.
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Making the iPhone vibrate
...nctions that take a parameter kSystemSoundID_Vibrate:
1) AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
2) AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
Both of the functions vibrate the iPhone. But, when you use the first
function on devices that don’t support vibration, it ...
Check OS version in Swift?
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For iOS, try:
var systemVersion = UIDevice.current.systemVersion
For OS X, try:
var systemVersion = NSProcessInfo.processInfo().operatingSystemVersion
If you just want to check if the users is running at least a specifi...
AngularJS access scope from outside js function
...angularjs like a jquery/javascript event handler.
function change() {
alert("a");
var scope = angular.element($("#outer")).scope();
scope.$apply(function(){
scope.msg = 'Superhero';
})
}
Demo: Fiddle
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Differences between Emacs and Vim
...tter as a simple editor (fewer keys required for simple tasks)
more active scripting community - internal language: vimscript
one central repository of scripts, plugins, color schemes, ...
also extensible in python, ruby
can be made portable (emacs has some problems with that)
Emacs:
non...
Floating View 扩展：悬浮视图扩展，将组件转换为悬浮窗口 · App Inventor 2 中文网
...：通过 LayoutParams 设置窗口属性
权限系统：需要 SYSTEM_ALERT_WINDOW 权限
边距设置
重叠视图的边距列表格式：
索引 0：左边距
索引 1：上边距
索引 2：右边距
索引 3：下边距
动画效果
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How can I bind to the change event of a textarea in jQuery?
... oldVal = currentVal;
//action to be performed on textarea changed
alert("changed!");
});
jsFiddle Demo
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