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reactjs - Updating an object with setState in React

Is it at all possible to update object's properties with setState? Something like: this.state = { jasper: { ... and the second just does nothing. Any ideas? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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182 views

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windows - Iterate all files in a directory using a 'for' loop

How can I iterate over each file in a directory using a for loop? And how could I tell if a certain entry is a directory or if it's just a file? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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angularjs - How to use a filter in a controller?

I have written a filter function which will return data based on the argument you are passing. I want the same ... filter function name, it is not working. } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Difference between Covariance & Contra-variance

I am having trouble understanding the difference between covariance and contravariance. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - Express.js: how to get remote client address

I don't completely understand how I should get a remote user IP address. Let's say I have a simple request ... is there a better way? And what about proxies? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cmd - Assign output of a program to a variable using a MS batch file

I need to assign the output of a program to a variable using a MS batch file. So in GNU Bash shell ... file. Something like set VAR=application arg0 arg1. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is the sizeof(some pointer) always equal to four?

For example: sizeof(char*) returns 4. As does int*, long long*, everything that I've tried. Are there any exceptions to this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is correct content-type for excel files?

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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269 views

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javascript - Property '...' has no initializer and is not definitely assigned in the constructor

in my Angular app i have a component: import { MakeService } from './../../services/make.service'; import { Component ... . I dont know what to do with it... Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?

This is what I've read so far about PDO::ATTR_EMULATE_PREPARES: PDO's prepare emulation is better for ... cache and the security of prepared statements? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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http headers - How to prevent Browser cache for php site

I have a php site running in cloud server.When ever i add new files css, js or images the browser is ... the same files cached in browser instead of new one Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Obtaining a powerset of a set in Java

The powerset of {1, 2, 3} is: {{}, {2}, {3}, {2, 3}, {1, 2}, {1, 3}, {1, 2, 3}, {1}} ... the best possible order of complexity? (I think it might be O(2^n).) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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120 views

1 answer

c# - Embedding JavaScript engine into .NET

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - Is it possible to do a sparse checkout without checking out the whole repository first?

I'm working with a repository with a very large number of files that takes hours to checkout. I'm ... checkout without checking out all the files first? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - how to make a whole row in a table clickable as a link?

I'm using Bootstrap and the following doesn't work: <tbody> <a href="#"> <tr> <td>Blah Blah</td> <td>1234567</td> <td>￡158,000</td> </tr> </a> </tbody> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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123 views

1 answer

c++ - Pure virtual function with implementation

My basic understanding is that there is no implementation for a pure virtual function, however, I was told ... a pure virtual function with an implementation? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

1 answer

apache - How to Set AllowOverride all

I want to set the AllowOverride all But I don't know how to do it. I have found the following code by searching the ... where to put this code or how to do it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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126 views

1 answer

android - getViewTypeCount and getItemViewType methods of ArrayAdapter

Can somebody in plain words explain me the usage of getViewTypeCount() and getItemViewType() methods of ArrayAdapter? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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111 views

1 answer

Is there an interpreter for C?

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to filter multiple values (OR operation) in angularJS

I want to use the filter in angular and want to filter for multiple values, if it has either one of the values then it ... ) but I don't want to use eval()... Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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274 views

1 answer

jsf 2 - Spawning threads in a JSF managed bean for scheduled tasks using a timer

I would like to know if it's ok to use Timer inside application scoped beans. Example, lets say that I want to ... this or should I stick with the old pattern? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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462 views

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resources - Different values folders in android

I am creating different values folders in my app (values, values-ldpi, values-mdpi, values-hdpi, values-xhdpi, ... also want to know which way is better? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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128 views

1 answer

Why doesn't a Javascript return statement work when the return value is on a new line?

Consider the following JavaScript: function correct() { return 15; } function wrong() { return 15; } console.log("correct ... .log("wrong() called : "+wrong()); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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132 views

1 answer

java - CombinedDomainXYPlot not rescaling domain axis

When I hide number of series from a chart that is using a CombinedDomainXYPlot, all range axes are auto rescaled ... scaling of a domain axis in this setting? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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98 views

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c# - How to get started with developing Internet Explorer extensions?

Does anyone here have experience with/in developing IE extensions that can share their knowledge? This would include code samples, ... in C++, I can do that. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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181 views

1 answer

java - What is @ModelAttribute in Spring MVC?

What is the purpose and usage of @ModelAttribute in Spring MVC? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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351 views

1 answer

mysql - How to get multiple counts with one SQL query?

I am wondering how to write this query. I know this actual syntax is bogus, but it will help you ... 'SELECT distributor_id, COUNT(*) GROUP BY distributor_id' Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

1 answer

Node.js: what is ENOSPC error and how to solve?

I have a problem with Node.js and uploading files to server. For uploading files to server I use this plugin. When ... /vol overflow 1.0M 1.0M 0 100% /tmp Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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