大约有 47,000 项符合查询结果（耗时：0.0227秒） [XML]
条码扫描器组件扫描时报错：Your device does not have a scanning applica...
...勾选）即可
原理的话，具体请参考文档：https://www.fun123.cn/reference/ ... html#BarcodeScanner
设置是否要使用外部扫描程序，例如扫码机。 如果为 假，则将会使用已集成到 App Inventor 中的 ZXing 的某个版本（注：ZXing是一个开源Java类...
How to split data into training/testing sets using sample function
...row(mtcars))
## set the seed to make your partition reproducible
set.seed(123)
train_ind <- sample(seq_len(nrow(mtcars)), size = smp_size)
train <- mtcars[train_ind, ]
test <- mtcars[-train_ind, ]
share
...
Access event to call preventdefault from custom function originating from onclick attribute of tag
... ok, I see all I had to do is to put my parameter second myfunc(event, {a:123, b:"asdas"})
– Omu
Dec 23 '11 at 10:01
1
...
Tainted canvases may not be exported
...he case of html5 canvas , not img elements
– graphics123
Oct 4 '16 at 6:57
11
In the case of a ca...
Sending Arguments To Background Worker?
...
You start it like this:
int value = 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
...
What linux shell command returns a part of a string? [duplicate]
...
In bash you can try this:
stringZ=abcABC123ABCabc
# 0123456789.....
# 0-based indexing.
echo ${stringZ:0:2} # prints ab
More samples in The Linux Documentation Project
share...
Could not load file or assembly 'System.Data.SQLite'
...
123
System.Data.SQLite.dll is a mixed assembly, i.e. it contains both managed code and native code...
How to scroll to the bottom of a UITableView on the iPhone before the view appears
...cob Relkin
147k2929 gold badges330330 silver badges312312 bronze badges
14
...
Which terminal command to get just IP address and nothing else?
...ou know the interface, you could use:
~$ ipconfig getifaddr en0
192.168.1.123
which will return just the IP address.
Or you could loop over possible interface names, starting with a suffix, i.e. en:
for NUMBER in $(seq 0 5); do
ip=`ipconfig getifaddr en$NUMBER`
if [ -n "$ip" ]; then
...
Inserting multiple rows in mysql
...ship) table :
// get data
$table_1 = get_table_1_rows();
$table_2_fk_id = 123;
// prepare first part of the query (before values)
$query = "INSERT INTO `table` (
`table_1_fk_id`,
`table_2_fk_id`,
`insert_date`
) VALUES ";
//loop the table 1 to get all foreign keys and put it in array
for...