大约有 47,000 项符合查询结果（耗时：0.0630秒） [XML]
capturing self strongly in this block is likely to lead to a retain cycle
...y access of self.timerDisp - you can't refer to self or properties on self from within a block that will be strongly retained by self.
You can get around this by creating a weak reference to self before accessing timerDisp inside your block:
__weak typeof(self) weakSelf = self;
[player addPeriodic...
Why would a JavaScript variable start with a dollar sign? [duplicate]
... common use in jQuery is to distinguish jQuery objects stored in variables from other variables.
For example, I would define:
var $email = $("#email"); // refers to the jQuery object representation of the dom object
var email_field = $("#email").get(0); // refers to the dom object itself
I fin...
Why does Ruby 1.9.2 remove “.” from LOAD_PATH, and what's the alternative?
... @Joshua Cheek: Also, as a sort-of counterbalance to removing . from $LOAD_PATH, Ruby 1.9.2 introduces require_relative which ... surprise ... require s a file relative to the location of the currently executing file (i.e. relative to File.dirname(__FILE__) ).
– Jör...
Why do people put code like “throw 1; ” and “for(;;);” in front of json responses? [du
...;/script>
What will happen now is that the Javascript code that comes from Google -- which the asker thought would be benign and immediately fall out of scope -- will actually be posted to my evil site. Suppose that the URL requested in the script tag sends (because your browser will present th...
Shortest distance between a point and a line segment
...e line.
// It falls where t = [(p-v) . (w-v)] / |w-v|^2
// We clamp t from [0,1] to handle points outside the segment vw.
const float t = max(0, min(1, dot(p - v, w - v) / l2));
const vec2 projection = v + t * (w - v); // Projection falls on the segment
return distance(p, projection);
}
...
Remove leading comma from a string
...lit("','");
["first string", "more", "even more"]
To extract a substring from a string I usually use slice() but substr() and substring() also do the job.
share
|
improve this answer
|
...
RESTfully design /login or /register resources?
... in particular as not REST-ful: the use of a GET request for logging out.
(from http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Safe_methods)
Some methods (for example, HEAD, GET, OPTIONS and TRACE) are defined as safe, which means they are intended only for information retrieval and shoul...
Java, List only subdirectories from a directory, not files
In Java, How do I list only subdirectories from a directory?
13 Answers
13
...
Rails ActionMailer - format sender and recipient name/email address
...ully validate or escape the name and email, you can end up with an invalid From header by simply concatenating strings. Here is a safe way:
require 'mail'
address = Mail::Address.new email # ex: "john@example.com"
address.display_name = name.dup # ex: "John Doe"
# Set the From or Reply-To header ...
Circle line-segment collision detection algorithm?
I have a line from A to B and a circle positioned at C with the radius R.
27 Answers
...