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How to enable cross-origin resource sharing (CORS) in the express.js framework on node.js
...rigin = req.headers.origin;
console.log(origin)
console.log(allowedOrigins.indexOf(origin) > -1)
// Website you wish to allow to
if (allowedOrigins.indexOf(origin) > -1) {
res.setHeader("Access-Control-Allow-Origin", origin);
}
// res.setHeader("Access-Control-Allow-Origin", "http://localho...
How to concatenate columns in a Postgres SELECT?
...catenated to NULL is NULL. If NULL values can be involved and the result shall not be NULL, use concat_ws() to concatenate any number of values (Postgres 9.1 or later):
SELECT concat_ws(', ', a, b) AS ab FROM foo;
Or concat() if you don't need separators:
SELECT concat(a, b) AS ab FROM foo;
No...
Rails 3: “field-with-errors” wrapper changes the page appearance. How to avoid this?
...iew::Base.field_error_proc = Proc.new do |html_tag, instance|
class_attr_index = html_tag.index 'class="'
if class_attr_index
html_tag.insert class_attr_index+7, 'error '
else
html_tag.insert html_tag.index('>'), ' class="error"'
end
end
This allows me to merely add a class nam...
Get index of selected option with jQuery
I'm a little bit confused about how to get an index of a selected option from a HTML <select> item.
7 Answers
...
What is the most “pythonic” way to iterate over a list in chunks?
... Note this works only for sequences that support items access by index and won't work for generic iterators, because they may not support __getitem__ method.
– apollov
Dec 22 '17 at 18:17
...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... 或 直接中文(浏览器自动utf编码)。
总结
最后我是使用php所以直接使用urlencode()函数直接处理了，这样使用get获取会自动解析，同时也解决了中文路径乱码问题了。
伪静态 Rewrite 重写 中文乱码
What is the difference between range and xrange functions in Python 2.X?
...garding breaking existing applications) as range was mostly for generating indexes to be used in for loops as "for i in range(1, 10):"
– Benjamin Autin
Sep 19 '08 at 3:52
10
...
Is it possible to use “/” in a filename?
...nstruct the name from the encoded version.
Another option is to create an index - create the output filename using whatever method you like - sequentially-numbered names, SHA1 hashes, whatever - then write a file with the generated filename/URL pair. You can save that into a hash and use it to do a...
How do you list the primary key of a SQL Server table?
..., how do you list the primary key of a table with T-SQL? I know how to get indexes on a table, but can't remember how to get the PK.
...
Detect Safari browser
...
You can easily use index of Chrome to filter out Chrome:
var ua = navigator.userAgent.toLowerCase();
if (ua.indexOf('safari') != -1) {
if (ua.indexOf('chrome') > -1) {
alert("1") // Chrome
} else {
alert("2") // Safari
}
}
...