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What underlies this JavaScript idiom: var self = this?
...nctions.
In instances where we would have used var self = this:
function test() {
var self = this;
this.hello = "world";
document.getElementById("test_btn").addEventListener("click", function() {
console.log(self.hello); // logs "world"
});
};
We can now use an arrow func...
How do I tell if a regular file does not exist in Bash?
...
The test command ([ here) has a "not" logical operator which is the exclamation point (similar to many other languages). Try this:
if [ ! -f /tmp/foo.txt ]; then
echo "File not found!"
fi
...
【解决】File does not reside within any path specified using proto_pat...
...pecified-using-proto-path使用protoc编译 proto文件时报错： main test test proto: File does not reside within any path specified using --proto_path (or -I) You must specify 使用protoc编译.proto文件时报错：
../main/test/test.proto: File does not reside within any path spec...
PHP's array_map including keys
...
Not with array_map, as it doesn't handle keys.
array_walk does:
$test_array = array("first_key" => "first_value",
"second_key" => "second_value");
array_walk($test_array, function(&$a, $b) { $a = "$b loves $a"; });
var_dump($test_array);
// array(2) {
// ["...
Iterating each character in a string using Python
... through the string, use enumerate():
>>> for i, c in enumerate('test'):
... print i, c
...
0 t
1 e
2 s
3 t
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VS2005混合编译ARM汇编代码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...（以Larry Bank的code为例）
ARM汇编代码，文件命名为armtest.asm：
; TITLE("Sample App")
;++
AREA sample, CODE, READONLY ; name this block of code
EXPORT TEST
IMPORT iGlobal
;
; Called from C as int ARMTEST1(int, int, int, int);
; The first 4 par...
Android. WebView and loadData
... on Android 4.0, which apparently ignores character encoding inside HTML.
Tested on 2.3 and 4.0.3.
In fact, I have no idea about what other values besides "base64" does the last parameter take. Some Google examples put null in there.
...
What is aria-label and how should I use it?
... ARIA can lead to significantly worse accessibility if not implemented and tested properly. Don't use ARIA just to have some "cool things in the code" which you don't fully understand. Sadly too often ARIA implementations introduce more issues than solutions in terms of accessibility. This is rather...
Flexbox and Internet Explorer 11 (display:flex in ?)
...="Content-Type" content="text/html; charset=UTF-8" >
<title>Flex Test</title>
<style>
html, body {
margin: 0px;
padding: 0px;
height: 100vh;
}
.main {
display: -webkit-flex;
display: flex;
-ms-flex-direction: row;
flex-direction: row;
...
MySQL Update Inner Join tables query
... said the query yielded a syntax error, I created some tables that I could test it against and confirmed that there is no syntax error in my query:
mysql> create table business (business_id int unsigned primary key auto_increment, mapx varchar(255), mapy varchar(255)) engine=innodb;
Query OK, 0 ...