大约有 30,000 项符合查询结果（耗时：0.0404秒） [XML]
Check if an apt-get package is installed and then install it if it's not on Linux
I'm working on a Ubuntu system and currently this is what I'm doing:
22 Answers
22
...
How to unsubscribe to a broadcast event in angularJS. How to remove function registered via $on
...
I think that Angular did it this way because a lot of the time inline anonymous functions are used as arguments to the $on function. In order to call $scope.$off(type, function) we'd need to keep a reference to the anonymous function. It is just thinking in a different way to how on...
Type of conditional expression cannot be determined because there is no implicit conversion between
...ne of x and y has a type and certain good conditions are met, or a compile-time error occurs. Here, "certain good conditions" means certain conversions are possible, which we will get into the details of below.
Now, let's turn to the germane part of the spec:
If only one of x and y has a type, and ...
Sequelize.js: how to use migrations and sync
...y suggestion is to do it before app starts and tries to serve routes every time. Something like this:
umzug.pending().then(function(migrations) {
// "migrations" will be an Array with the names of
// pending migrations.
umzug.execute({
migrations: migrations,
method: 'up...
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...6
7
8
9
10
11
12
13
14
15
16
17
#include <stdio.h>
struct str{
int len;
char s[0];
};
struct foo {
struct str *a;
};
int main(int argc, char** argv) {
struct foo f={0};
if (f.a->s) {
printf( f.a->s);
}
...
How can jQuery deferred be used?
...still not perfect, since you never clear / update the cache once the first time fetched. This will make AJAX call not working for any update.
– zyzyis
Apr 11 '14 at 7:47
...
Length of string in bash
How do you get the length of a string stored in a variable and assign that to another variable?
8 Answers
...
How to disallow temporaries
...
This one doesn't result in a compiler error, but a runtime error. Instead of measuring a wrong time, you get an exception which may be acceptable too.
Any constructor you want to guard needs a default argument on which set(guard) is called.
struct Guard {
Guard()
:guard...
Difference between map, applymap and apply methods in Pandas
...
Quick Summary
DataFrame.apply operates on entire rows or columns at a time.
DataFrame.applymap, Series.apply, and Series.map operate on one
element at time.
Series.apply and Series.map are similar and often interchangeable. Some of their slight differences are discussed in osa's answer belo...
How does PHP 'foreach' actually work?
...cally you have the same situation as above.
Another small variation, this time we'll assign the array to another variable:
$foo = $array;
foreach ($array as $val) {
var_dump(current($array));
}
/* Output: 1 1 1 1 1 */
Here the refcount of the $array is 2 when the loop is started, so for once...