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linux - Difference between ${} and $() in Bash

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

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iphone - Finding image type from NSData or UIImage

I am loading an image from a URL provided by a third-party. There is no file extension (or filename for that ... an extension) perhaps this is a non-issue. Question&Answers:os...

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

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How to round a Double to the nearest Int in swift?

I'm trying to make a calculator of growth rate (Double) that will round the result to the nearest Integer and recalculate ... , which I don't want it to happen. Question&Answers:os...

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

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c# - Convert.ChangeType() fails on Nullable Types

I want to convert a string to an object property value, whose name I have as a string. I am trying to do ... similiar questions but still can't get it to work. Question&Answers:os...

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

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c++ - What made i = i++ + 1; legal in C++17?

Before you start yelling undefined behaviour, this is explicitly listed in N4659 (C++17) i = i++ + 1; // ... scalar object" as the id-expression is a lvalue. Question&Answers:os...

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

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ruby on rails - Webrick is very slow to respond. How to speed it up?

I have a Rails application that I'm running on my server. When I go to a remote desktop and attempt ... Oracle? Has anyone experienced anything similar to this? Question&Answers:os...

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

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jquery - Datatables: Cannot read property 'mData' of undefined

I have an issue with Datatables. I also went through this link which didn't yield any results. I have included all the ... "aTargets": [2] }], }); }); Question&Answers:os...

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

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python - Pandas: Looking up the list of sheets in an excel file

The new version of Pandas uses the following interface to load Excel files: read_excel('path_to_file.xls', 'Sheet1 ... sheets from an excel document in Pandas? Question&Answers:os...

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

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javascript - input type=file show only button

Is there a way to style (or script) <input type=file /> element to have visible only "Browse" button without ... better without text field, if it's possible. Question&Answers:os...

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

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unix - Executing JavaScript without a browser?

I am looking into Javascript programming without a browser. I want to run scripts from the Linux or ... viable scripting language for processing large data. Question&Answers:os...

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

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python - Making an asynchronous task in Flask

I am writing an application in Flask, which works really well except that WSGI is synchronous and blocking. I have ... maybe Celery is a good choice for this? Question&Answers:os...

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

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javascript - Call a Vue.js component method from outside the component

Let's say I have a main Vue instance that has child components. Is there a way of calling a method belonging ... ">Internal Button</button> </div> </template> Question&Answers:os...

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

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iphone - Accordion table cell - How to dynamically expand/contract uitableviewcell?

I am trying create an accordion type of uitableviewcell that, when the user selects the cell, it expands to display a ... cell off and on the screen. Any ideas? Question&Answers:os...

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

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shell - How to generate random number in Bash?

How to generate a random number within a range in Bash? Question&Answers:os...

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

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Is it better practice to use String.format over string Concatenation in Java?

Is there a perceptible difference between using String.format and String concatenation in Java? I tend to use ... readable depends on how your head works. Question&Answers:os...

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

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swift - How to present popover properly in iOS 8

I'm trying to add a UIPopoverView to my Swift iOS 8 app, but I am unable to access the PopoverContentSize ... my popover? Any help would be highly appreciated! Question&Answers:os...

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

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sql - How can I get around MySQL Errcode 13 with SELECT INTO OUTFILE?

I am trying to dump the contents of a table to a csv file using a MySQL SELECT INTO OUTFILE statement. If I do: ... . This is MySQL 5.0.75 running on Ubuntu. Question&Answers:os...

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

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Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?

I was wondering if there exists a way to run an untrusted C program under a sandbox in Linux. Something that would ... it. So the program would be short lived. Question&Answers:os...

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

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iphone - Ignore certain exceptions when using Xcode's All Exceptions breakpoint

I have an All Exceptions breakpoint configured in Xcode: Sometimes Xcode will stop on a line like: [ ... any useful answers. Can they be linked? Question&Answers:os...

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

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ios5 - iOS 5 fixed positioning and virtual keyboard

I have a mobile website which has a div pinned to the bottom of the screen via position:fixed. All works ... this sort of behavior? Is this expected? Thanks. Question&Answers:os...

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

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python - Is nested function a good approach when required by only one function?

Closed. This question is opinion-based. 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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Confused about Angularjs transcluded and isolate scopes & bindings

I am struggling to understand the scope of models and their bindings in respect of directives which have limited ... or some other such thing. Many thanks. Question&Answers:os...

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

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AngularJS UI Router - change url without reloading state

Currently our project is using default $routeProvider, and I am using this "hack", to change url without reloading page: ... - is id of new item stored in db) Question&Answers:os...

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

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navbar - Align nav-items to right side in bootstrap-4

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

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javascript - How to pass in a react component into another react component to transclude the first component's content?

Is there a way to pass one component into another react component? I want to create a model react component ... (), document.getElementById('my-component')); Question&Answers:os...

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

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What is a postback?

I'm making my way into web development and have seen the word postback thrown around. Coming from a ... aware of postbacks would be most greatly appreciated. Question&Answers:os...

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

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unix - How does grep run so fast?

I am really amazed by the functionality of GREP in shell, earlier I used to use substring method in java but now I ... on the web. Can anyone help me with this? Question&Answers:os...

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

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c# - Delegates: Predicate vs. Action vs. Func

Can someone provide a good explanation (hopefully with examples) of these 3 most important delegates: Predicate Action Func Question&Answers:os...

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

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