大约有 8,100 项符合查询结果(耗时:0.0348秒) [XML]

https://stackoverflow.com/ques... 

Send attachments with PHP Mail()?

I need to send a pdf with mail, is it possible? 14 Answers 14 ...
https://stackoverflow.com/ques... 

How to sort a dataframe by multiple column(s)

I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort by column z (descending) then by column b (ascending): ...
https://stackoverflow.com/ques... 

jQuery Ajax POST example with PHP

...form id="foo"> <label for="bar">A bar</label> <input id="bar" name="bar" type="text" value="" /> <input type="submit" value="Send" /> </form> jQuery: // Variable to hold request var request; // Bind to the submit event of our form $("#foo").submit(fu...
https://stackoverflow.com/ques... 

Why can't I forward-declare a class in a namespace using double colons?

...++ language fully-qualified names are only used to refer to existing (i.e. previously declared) entities. They can't be used to introduce new entities. And you are in fact "reopening" the namespace to declare new entities. If the class Class is later defined as a member of different namespace - it ...
https://stackoverflow.com/ques... 

How does a garbage collector avoid an infinite loop here?

Consider the following C# program, I submitted it on codegolf as an answer to create a loop without looping: 3 Answers ...
https://stackoverflow.com/ques... 

Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?

The following are two methods of building a link that has the sole purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.? ...
https://stackoverflow.com/ques... 

Is there a generator version of `string.split()` in Python?

string.split() returns a list instance. Is there a version that returns a generator instead? Are there any reasons against having a generator version? ...
https://stackoverflow.com/ques... 

Push Notifications in Android Platform

I am looking to write an app that receives pushed alerts from a server. I found a couple of methods to do this. 20 Answer...
https://stackoverflow.com/ques... 

Why use static_cast(x) instead of (int)x?

I've heard that the static_cast function should be preferred to C-style or simple function-style casting. Is this true? Why? ...
https://stackoverflow.com/ques... 

Inheritance and Overriding __init__ in python

I was reading 'Dive Into Python' and in the chapter on classes it gives this example: 5 Answers ...