大约有 6,884 项符合查询结果（耗时：0.0169秒） [XML]
How do I store an array in localStorage? [duplicate]
...y "length" to determine the count of saved objects and the method "key(int index)" to get the current key. So you can try: for (var i = 0; i < localStorage.length; i++) console.log( localStorage.key(i) +" has value " + localStorage[localStorage.key(i)] )
– Sebastian
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How to split a String by space
...g", " ");
String[] splited = new String[tokens.countTokens()];
int index = 0;
while(tokens.hasMoreTokens()){
splited[index] = tokens.nextToken();
++index;
}
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Good tutorial for using HTML5 History API (Pushstate?) [closed]
... mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.html$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.html [L]
</IfModule>
Nginx
rewrite ^(.+)$ /index.html last;
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Return multiple columns from pandas apply()
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If the pd.Series needs an index, you need to supply it with pd.Series(data, index=...). Otherwise you get cryptic errors when you try to assign the result back into the parent dataframe.
– smci
Nov 25 '19 at 11:0...
How update the _id of one MongoDB Document?
... A fun issue with this appears if some field on that document has a unique index. In that situation, your example will fail because a document cannot be inserted with a duplicate value in a unique indexed field. You could fix this by doing the delete first, but that is a bad idea because if your i...
How do I decode HTML entities in Swift?
...hod starts here =====
var result = ""
var position = startIndex
// Find the next '&' and copy the characters preceding it to `result`:
while let ampRange = self[position...].range(of: "&") {
result.append(contentsOf: self[position ..< ampRange...
How do I load my script into the node.js REPL?
... enter the REPL even if stdin
node -e 'var client = require("./build/main/index.js"); console.log("Use `client` in repl")' -i
Then you can add to package.json scripts
"repl": "node -e 'var client = require(\"./build/main/index.js\"); console.log(\"Use `client` in repl\")' -i",
tested using nod...
python-pandas and databases like mysql
...chema', echo=False)
f = pd.read_sql_query('SELECT * FROM mytable', engine, index_col = 'ID')
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How do I specify local .gem files in my Gemfile?
...tem:
Just put your .gem files in a local directory, then use "gem generate_index" to make it a Gem repository
mkdir repo
mkdir repo/gems
cp *.gem repo/gems
cd repo
gem generate_index
Finally point bundler to this location by adding the following line to your Gemfile
source "file://path/to/repo"
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IN vs OR in the SQL WHERE Clause
... is faster.
I tried both on a MySQL with 1000000 rows. When the column is indexed there is no discernable difference in performance - both are nearly instant. When the column is not indexed I got these results:
SELECT COUNT(*) FROM t_inner WHERE val IN (1000, 2000, 3000, 4000, 5000, 6000, 7000, 80...