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security - Why is using the JavaScript eval function a bad idea?

The eval function is a powerful and easy way to dynamically generate code, so what are the caveats? Question&Answers:os...

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

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python - Pandas conditional creation of a series/dataframe column

I have a dataframe along the lines of the below: Type Set 1 A Z 2 B Z 3 B X 4 C Y I want to add ... Set equals anything else. What's the best way to do this? Question&Answers:os...

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

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html - Make a div fill the height of the remaining screen space

I am working on a web application where I want the content to fill the height of the entire screen. The page has a header, ... ...</div> </td> </tr> </table> Question&Answers:os...

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

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jvm - How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

I am trying to use Notepad++ as my all-in-one tool edit, run, compile, etc. I have JRE installed, ... the difference between the PATH variable in JRE or JDK? Question&Answers:os...

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

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Retrieve only the queried element in an object array in MongoDB collection

Suppose you have the following documents in my collection: { "_id":ObjectId("562e7c594c12942f08fe4192"), "shapes":[ { "shape": ... "red"} ] } 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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sql - Retrieving the last record in each group - MySQL

There is a table messages that contains data as shown below: Id Name Other_Columns ----------------- ... inefficient. Any other ways to achieve the same result? Question&Answers:os...

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

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javascript - Prototypical inheritance - writing up

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

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How to split a string in Java

I have a string, "004-034556", that I want to split into two strings: string1="004"; string2="034556"; That ... I will throw an exception. 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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Parse JSON in JavaScript?

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

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html - CSS-only masonry layout

I need to implement a fairly run-off-the-mill masonry layout. However, for a number of reasons I don ... some newfangled flexbox magic that makes this possible? Question&Answers:os...

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

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How do I correctly clone a JavaScript object?

I have an object x. I'd like to copy it as object y, such that changes to y do not modify x. ... objects. How do I correctly clone a JavaScript object? Question&Answers:os...

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

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java - Non-static variable cannot be referenced from a static context

I've written this test code: class MyProgram { int count = 0; public static void main(String[] args) { ... I get my methods to recognize my class variables? Question&Answers:os...

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

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What is the difference between public, protected, package-private and private in Java?

In Java, are there clear rules on when to use each of access modifiers, namely the default (package ... class and interface and dealing with inheritance? Question&Answers:os...

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

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language agnostic - Why are floating point numbers inaccurate?

Why do some numbers lose accuracy when stored as floating point numbers? For example, the decimal number 9.2 can be ... big" to express in 64 bits of memory? Question&Answers:os...

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

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asp.net mvc - What is ViewModel in MVC?

I am new to ASP.NET MVC. I have a problem with understanding the purpose of a ViewModel. What is a ... about its working and explanation that would be better. Question&Answers:os...

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

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ios - Returning data from async call in Swift function

I have created a utility class in my Swift project that handles all the REST requests and responses. I have built a ... I want to return the NSArray... } } Question&Answers:os...

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

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696 views

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c - Removing trailing newline character from fgets() input

I am trying to get some data from the user and send it to another function in gcc. The code is something like ... do I remove that and send a proper string. Question&Answers:os...

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

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129 views

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javascript - Sorting an array of objects by property values

I've got the following objects using AJAX and stored them in an array: var homes = [ { "h_id": ... in ascending or descending order using JavaScript only? Question&Answers:os...

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

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227 views

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javascript - What is the explicit promise construction antipattern and how do I avoid it?

I was writing code that does something that looks like: function getStuffDone(param) { | function getStuffDone(param ... and why is this called an antipattern? Question&Answers:os...

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

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javascript - Dynamically access object property using variable

I'm trying to access a property of an object using a dynamic name. Is this possible? const something = { bar ... is to access something.bar, getting "Foobar!" Question&Answers:os...

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

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837 views

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jvm - How do I write a correct micro-benchmark in Java?

How do you write (and run) a correct micro-benchmark in Java? I'm looking for some code samples and ... and why? Related: Is stopwatch benchmarking acceptable? Question&Answers:os...

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

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219 views

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c - Why are these constructs using pre and post-increment undefined behavior?

#include <stdio.h> int main(void) { int i = 0; i = i++ + ++i; printf("%d ", i); // 3 i = 1; i = (i++); ... ], x[1]); // shouldn't this print 0 8? or 5 0? } Question&Answers:os...

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

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208 views

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apache - PHP code is not being executed, but the code shows in the browser source code

I'm trying to execute some PHP code on a project (using Dreamweaver) but the code isn't being run. When I check ... .: <? include_once("/code/configs.php"); ?> Question&Answers:os...

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

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79 views

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c++ - Undefined behavior and sequence points

What are "sequence points"? What is the relation between undefined behaviour and sequence points? I often use funny and ... by those who came up with the idea.) Question&Answers:os...

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

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javascript - var functionName = function() {} vs function functionName() {}

I've recently started maintaining someone else's JavaScript code. I'm fixing bugs, adding features and also trying to ... that can't be done with the other? Question&Answers:os...

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

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83 views

1 answer

How do I pass data between Activities in Android application?

I have a scenario where, after logging in through a login page, there will be a sign-out button on each ... to all activities? Any alternative to this case Question&Answers:os...

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

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99 views

1 answer

javascript - XMLHttpRequest cannot load XXX No 'Access-Control-Allow-Origin' header

tl;dr; About the Same Origin Policy I have a Grunt process which initiates an instance of express.js server. ... What is stopping me from accessing the page? Question&Answers:os...

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

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183 views

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In CSS Flexbox, why are there no "justify-items" and "justify-self" properties?

Consider the main axis and cross axis of a flex container: Source: W3C To align flex items along the main ... centered if adjacent boxes are equal width</p> Question&Answers:os...

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

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