大约有 40,000 项符合查询结果（耗时：0.0795秒） [XML]
How does Rails keep track of which migrations have run for a database?
.... If you roll back that migration, Rails will delete the corresponding row from schema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introd...
What is the difference between ManualResetEvent and AutoResetEvent in .NET?
...
Even worse, do not wait to long from setting the ARE to the WaitOne, or it will be resetted in the meantime. Had many abandoned threads with that.
– Oliver Friedrich
Dec 22 '08 at 9:53
...
Is there a way to check which CSS styles are being used or not used on a web page?
.../github.com/shashwatsahai/CSSExtractor/ This tool helps in getting the CSS from a specific page listing all sources for active styles and save it to a JSON with source as key and rules as value. It loads all the CSS from the href links and tells all the styles applied from them You can modify the co...
Efficient way to insert a number into a sorted array of numbers?
... How does the First Method compare now that Chrome uses TimSort? From TimSort Wikipedia: "In the best case, which occurs when the input is already sorted, [TimSort] runs in linear time".
– poshest
Feb 5 at 11:40
...
Should I be using object literals or constructor functions?
...ript are closures we can use private variables and methods and avoid new.
From http://javascript.crockford.com/private.html on private variables in JavaScript.
share
|
improve this answer
...
Looping through localStorage in HTML5 and JavaScript
...ere a reason I should use parse and not eval? I'm using eval now to get it from a string, but is parse better/faster?
– Oscar Godson
Jun 29 '10 at 21:15
1
...
How do I read all classes from a Java package in the classpath?
... in a Java package. Those classes are in classpath. I need to do this task from a Java program directly. Do you know a simple way to do?
...
Bordered UITextView
... is the UITextView, and the code goes wherever you'd set up the view (awakeFromNib or viewDidLoad are two possible places). Since there was no code given there's no way to give good context in response.
– Kendall Helmstetter Gelner
May 6 '11 at 16:10
...
Upload files with HTTPWebrequest (multipart/form-data)
...DATE: Using .NET 4.5 (or .NET 4.0 by adding the Microsoft.Net.Http package from NuGet) this is possible without external code, extensions, and "low level" HTTP manipulation. Here is an example:
// Perform the equivalent of posting a form with a filename and two files, in HTML:
// <form action="{...
Difference between var_dump,var_export & print_r
...
var_dump and var_export relate like this (from the manual)
var_export() gets structured
information about the given variable.
It is similar to var_dump() with one
exception: the returned representation
is valid PHP code.
They differ from print_r that va...