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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 use sidebar with the keyboard in Sublime Text 2 and 3?
...ut for removing the projects from the sidebar?
– depz123
Jun 19 '13 at 18:46
5
Can I invoke conte...
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
...
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, ]
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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
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App Inventor 2 连接方式：AI伴侣、模拟器、USB · App Inventor 2 中文网
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Update multiple columns in SQL
...
I tried with this way and its working fine :
UPDATE
Emp
SET
ID = 123,
Name = 'Peter'
FROM
Table_Name
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...
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...