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syntax - What does "use strict" do in JavaScript, and what is the reasoning behind it?

Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error: Problem at ... strict"; string or is it for future use? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ado.net - How do I view the SQL generated by the Entity Framework?

How do I view the SQL generated by entity framework ? (In my particular case I'm using the mysql provider - if it matters) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Dealing with multiple Python versions and PIP?

Is there any way to make pip play well with multiple versions of Python? For example, I want to use pip to ... it's not a solution to this particular problem. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Definitive List of Common Reasons for Segmentation Faults

NOTE: We have a lot of segfault questions, with largely the same answers, so I'm trying to collapse them into a ... causes of segmentation faults in C and C++? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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JavaScript OR (||) variable assignment explanation

Given this snippet of JavaScript... var a; var b = null; var c = undefined; var d = 4; var e = 'five ... true boolean value, rather than the value of d itself. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Tkinter understanding mainloop

Till now, I used to end my Tkinter programs with: tk.mainloop(), or nothing would show up! See example: from ... loop?tk.mainloop()? or both in my programs? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result

I get the error when trying to run this: <?php require_once('includes/DbConnector.php'); $connector = new ... ?> Does anyone know what the problem is? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rest - What exactly is RESTful programming?

What exactly is RESTful programming? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Static way to get 'Context' in Android?

Is there a way to get the current Context instance inside a static method? I'm looking for that way because ... the 'Context' instance each time it changes. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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browser - How to encode the filename parameter of Content-Disposition header in HTTP?

Web applications that want to force a resource to be downloaded rather than directly rendered in a Web ... Firefox Internet Explorer Safari Google Chrome Opera Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf - How can I pass selected row to commandLink inside dataTable or ui:repeat?

I'm using Primefaces in a JSF 2 application. I have a <p:dataTable>, and instead of selecting rows, I ... a fixed value). Anyone has an alternative solution? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jquery - How to filter the jqGrid data NOT using the built in search/filter box

I want users to be able to filter grid data without using the intrinsic search box. I have created two input ... this - does anyone have any ideas? Thanks. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost Spirit: "Semantic actions are evil"?

Reading and watching this presentation: http://boost-spirit.com/home/2011/06/12/ast-construction-with-the-universal-tree/ ... is too complex for me to chew... Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Entity Framework and Connection Pooling

I've recently started to use the Entity Framework 4.0 in my .NET 4.0 application and am curious about ... for certain scenarios that I should know about? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I properly compare two Integers in Java?

I know that if you compare a boxed primitive Integer with a constant such as: Integer a = 4; if (a < 5) a will automatically ... 4; Integer b = 5; if (a < b) ? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - await vs Task.Wait - Deadlock?

I don't quite understand the difference between Task.Wait and await. I have something similar to the following ... blocking wait rather than await Task.Delay? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why does GCC use multiplication by a strange number in implementing integer division?

I've been reading about div and mul assembly operations, and I decided to see them in action by writing a ... this magic number and why does everything work? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - How to develop or migrate apps for iPhone 5 screen resolution?

The new iPhone 5 display has a new aspect ratio and a new resolution (640 x 1136 pixels). What is ... the older displays and the new widescreen aspect ratio? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What is the purpose of the return statement?

What is the simple basic explanation of what the return statement is, how to use it in Python? And what is the difference between it and the print statement? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to use FormData for AJAX file upload?

This is my HTML which I'm generating dynamically using drag and drop functionality. <form method="POST" id="contact" name ... (data){ alert(data); } }); } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to make an Android Spinner with initial text "Select One"?

I want to use a Spinner that initially (when the user has not made a selection yet) displays the text "Select One" ... what I want. How can I fix this problem? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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utf 8 - Setting the default Java character encoding

How do I properly set the default character encoding used by the JVM (1.5.x) programmatically? I have read that -Dfile ... , "UTF8"); fos.write(in.getBytes()); Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When should I write the keyword 'inline' for a function/method?

When should I write the keyword inline for a function/method in C++? After seeing some answers, some related ... one writes 'inline' for a function/method? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Getting a stack overflow exception when declaring a large array

The following code is generating a stack overflow error for me int main(int argc, char* argv[]) { int ... allowing me to declare the size using a variable. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Change private static final field using Java reflection

I have a class with a private static final field that, unfortunately, I need to change it at run-time. Using ... hack.setAccessible(true); hack.set(null, true); Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Auto Scale TextView Text to Fit within Bounds

I'm looking for an optimal way to resize wrapping text in a TextView so that it will fit within its ... , wrapped, in its getHeight and getWidth bounds? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to enable NSZombie in Xcode?

I have an app that is crashing with no error tracing. I can see part of what is going on if I debug, ... Does anybody know how to enable NSZombie in Xcode 4? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Sorting list based on values from another list

I have a list of strings like this: X = ["a", "b", "c", "d", "e", "f", "g", "h", "i ... constructs but I am curious if there is a shorter way. Any suggestions? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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