大约有 38,000 项符合查询结果（耗时：0.0355秒） [XML]
手机测高仪 · App Inventor 2 中文网
...米的树误差在一米以内——
对于”这树大概多高”这个问题，完全够用了。
想更准的话，专业的测距仪用的是激光测距 + 角度传感器，
把”距离”这个最大的误差源也自动化了。原理和我们这个是一样的，就是这个三角形。
...
SQLite error 'attempt to write a readonly database' during insert?
...
Good idea, but no-go. Whoever PHP is running as doesn't have write privileges, so it can't create the file. Is there anyway PHP can retrieve what user it is currently running as?
– Austin Hyde
Jul 23 '10 at 18:24
...
Base64 Java encode and decode a string [duplicate]
...ring str = new String(DatatypeConverter.printBase64Binary(new String("user:123").getBytes()));
String res = DatatypeConverter.parseBase64Binary(str);
System.out.println(res);
}
}
share
|
...
How to create a checkbox with a clickable label?
...
With PHP, wont that make $_POST['foo'] always have one of the two values maximum at one time? Even if both checked. What's a checkbox group?
– jeromej
Jun 9 '14 at 9:27
...
Split string to equal length substrings in Java
...s trick will work (for example) in Java, Perl, .NET and JGSoft, but not in PHP (PCRE), Ruby 1.9+ or TextMate (both Oniguruma). JavaScript's /y (sticky flag) isn't as flexible as \G, and couldn't be used this way even if JS did support lookbehind.
I should mention that I don't necessarily recommend...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...
(CustomerFirstName,CustomerLastName, CustomerCityStateZip) ('Joe','Blow','123 Main St Washington, MD 12345', 123.45)
create view vwStagingTable AS
SELECT CustomerFirstName = CAST(CustomerFirstName as CHAR(30)),
CustomerLastName = CAST(CustomerLastName as CHAR(30)),
CustomerCityStateZip = CAST(Cust...
How to debug Lock wait timeout exceeded on MySQL?
...he process and the transaction is exactly in the example. The process is a PHP process. Transaction is a transaction as defined by innodb-trx-table. In my case, I had two PHP processes, in each I started a transaction manually. The interesting part was that even though I started one transaction in a...
Convert string to a variable name
...reg mentioned, assign to assign the variables.
original_string <- c("x=123", "y=456")
pairs <- strsplit(original_string, "=")
lapply(pairs, function(x) assign(x[1], as.numeric(x[2]), envir = globalenv()))
ls()
share
...
Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
...hing similar but I'm not sure what to google.
– teter123f
Aug 15 at 19:36
add a comment
|
...
Origin null is not allowed by Access-Control-Allow-Origin
...t to a server from a local html file and found a solution using Chrome and PHP. (no Jquery)
Javascripts:
var x = new XMLHttpRequest();
if(x) x.onreadystatechange=function(){
if (x.readyState === 4 && x.status===200){
console.log(x.responseText); //Success
}else{
...