大约有 19,000 项符合查询结果（耗时：0.0522秒） [XML]
How to properly reuse connection to Mongodb across NodeJs application and modules
...re( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( url, { useNewUrlParser: true }, function( err, client ) {
_db = client.db('test_db');
return callback( err );
} );...
Keyboard Interrupts with python's multiprocessing Pool
...s to specify a timeout. To do that, replace
results = pool.map(slowly_square, range(40))
with
results = pool.map_async(slowly_square, range(40)).get(9999999)
or similar.
share
|
impro...
Paste multiple columns together
...c('d', 'e', 'f'),
'd' = c('g', 'h', 'i'))
tidyr::unite_(data, paste(colnames(data)[-1], collapse="_"), colnames(data)[-1])
a b_c_d
1 1 a_d_g
2 2 b_e_h
3 3 c_f_i
Edit: Exclude first column, everything else gets pasted.
# tidyr_0.6.3
unite(data, newCol, -a)
# or by colum...
How can jQuery deferred be used?
...he new Deferred object and the attached methods .when , .Deferred and ._Deferred .
11 Answers
...
How should I call 3 functions in order to execute them one after the other?
...we have three asynchronous functions that we want to execute in order, some_3secs_function, some_5secs_function, and some_8secs_function.
Since functions can be passed as arguments in Javascript, you can pass a function as a callback to execute after the function has completed.
If we create the fu...
Excel: last character/string match in a string
...st came up with this solution, no VBA needed;
Find the last occurance of "_" in my example;
=IFERROR(FIND(CHAR(1);SUBSTITUTE(A1;"_";CHAR(1);LEN(A1)-LEN(SUBSTITUTE(A1;"_";"")));0)
Explained inside out;
SUBSTITUTE(A1;"_";"") => replace "_" by spaces
LEN( *above* ) => count the chars
LEN(A1)...
Does Swift have documentation generation support?
...// You can use bulleted lists (use `-`, `+` or `*`):
///
/// - Text can be _emphasised_
/// - Or **strong**
///
/// Or numbered lists:
///
/// 7. The numbers you use make no difference
/// 0. The list will still be ordered, starting from 1
/// 5. But be sensible and just use 1, 2, 3 etc…
///
/// -...
Passing $_POST values with cURL
How do you pass $_POST values to a page using cURL ?
8 Answers
8
...
Leaflet - How to find existing markers, and delete markers?
...
The layers are internally stored in map._layers.
– flup
Jan 26 '13 at 14:51
11
...
What is the most efficient way to deep clone an object in JavaScript?
...actical.
class StructuredCloner {
constructor() {
this.pendingClones_ = new Map();
this.nextKey_ = 0;
const channel = new MessageChannel();
this.inPort_ = channel.port1;
this.outPort_ = channel.port2;
this.outPort_.onmessage = ({data: {key, value}}) => {
const r...