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php - How should a model be structured in MVC?

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

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javascript - How to make an AJAX call without jQuery?

How to make an AJAX call using JavaScript, without using jQuery? Question&Answers:os...

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

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eclipse - R cannot be resolved - Android error

I just downloaded and installed the new Android SDK. I wanted to create a simple application to test drive it. ... XML file named main.xml under res/layout/. Question&Answers:os...

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

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javascript - Scroll to an element with jQuery

I have this input element: <input type="text" class="textfield" value="" id="subject" name="subject"> ... to use the default jQuery features to achieve this. Question&Answers:os...

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

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version control - How do I undo the most recent local commits in Git?

I accidentally committed the wrong files to Git, but didn't push the commit to the server yet. How can I undo ... git commit was run. Is there a better way? Question&Answers:os...

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

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mysql - Using LIMIT within GROUP BY to get N results per group?

The following query: SELECT year, id, rate FROM h WHERE year BETWEEN 2000 AND 2009 AND id IN (SELECT rid ... LIMIT like modifier that works within the GROUP BY? Question&Answers:os...

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

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Performance optimization strategies of last resort

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

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javascript - Is it possible for flex items to align tightly to the items above them?

This is, in effect, the Pinterest layout. However, the solutions found online are wrapped in columns, which means ... to resort to a JS solution like Masonry? Question&Answers:os...

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

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c - What does the comma operator , do?

What does the , operator do in C? Question&Answers:os...

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

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performance - How can you profile a Python script?

Project Euler and other coding contests often have a maximum time to run or people boast of how fast their ... how long a Python program takes to run? Question&Answers:os...

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

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Syntax error on print with Python 3

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

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c++ - What is the difference between #include <filename> and #include "filename"?

In the C and C++ programming languages, what is the difference between using angle brackets and using ... follows? #include <filename> #include "filename" Question&Answers:os...

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

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obfuscation - How can I obfuscate (protect) JavaScript?

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

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javascript - No 'Access-Control-Allow-Origin' header is present on the requested resource—when trying to get data from a REST API

I'm trying to fetch some data from the REST API of HP Alm. It works pretty well with a ... the XMLHttpRequest is controlled by the withCredentials attribute. Question&Answers:os...

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

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r - Aggregate / summarize multiple variables per group (e.g. sum, mean)

From a data frame, is there a easy way to aggregate (sum, mean, max et c) multiple variables simultaneously? Below are ... data=df1, sum, na.rm=TRUE) head(df2) Question&Answers:os...

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

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Loop through an array in JavaScript

In Java you can use a for loop to traverse objects in an array as follows: String[] myStringArray = {"Hello" ... something } Can you do the same in JavaScript? Question&Answers:os...

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

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asp.net mvc 4 - Submit same Partial View called multiple times data to controller?

I have added a button in my view. When this button is clicked partial view is added. In my ... ValidationMessageFor(model => model.productTotalQuantity) </div> Question&Answers:os...

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

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python - UnboundLocalError on local variable when reassigned after first use

The following code works as expected in both Python 2.5 and 3.0: a, b, c = (1, 2, 3) ... scope before it exists. Could someone please explain this behavior? Question&Answers:os...

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

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c# - Deep cloning objects

I want to do something like: MyObject myObj = GetMyObj(); // Create and fill a new object MyObject ... any changes being reflected in the original object? Question&Answers:os...

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

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javascript - Google Maps JS API v3 - Simple Multiple Marker Example

Fairly new to the Google Maps Api. I've got an array of data that I want to cycle through and plot on ... infoWindow pop up when clicked to display the name. Question&Answers:os...

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

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python - How to serve static files in Flask

So this is embarrassing. I've got an application that I threw together in Flask and for now it is just serving up ... ? I know this is going to be dead simple. Question&Answers:os...

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

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javascript - Preview an image before it is uploaded

I want to be able to preview a file (image) before it is uploaded. The preview action should be executed all in the ... to upload the image. How can I do this? Question&Answers:os...

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

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javascript - What is event bubbling and capturing?

What is the difference between event bubbling and capturing? When should one use bubbling vs capturing? Question&Answers:os...

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

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350 views

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What is the "N+1 selects problem" in ORM (Object-Relational Mapping)?

The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, ... have a more detailed explanation of the problem? Question&Answers:os...

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

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335 views

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r - Reshaping multiple sets of measurement columns (wide format) into single columns (long format)

I have a dataframe in a wide format, with repeated measurements taken within different date ranges. In my example ... of value columns in this particular way. Question&Answers:os...

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

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103 views

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javascript - Split array into chunks

Let's say that I have an Javascript array looking as following: ["Element 1","Element 2","Element 3",...]; ... arrays with, lets say, 10 elements at its most? Question&Answers:os...

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

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regex - What do 'lazy' and 'greedy' mean in the context of regular expressions?

What are these two terms in an understandable way? Question&Answers:os...

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

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Why do I need to override the equals and hashCode methods in Java?

Recently I read through this Developer Works Document. The document is all about defining hashCode() and ... decision to implement these methods efficiently? Question&Answers:os...

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

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