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javascript - window.onload vs <body onload=""/>

What exactly is the difference between the window.onload event and the onload event of the body tag? when do I use which and how should it be done correctly? Question&Answers:os...

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

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490 views

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connection - Using R to download zipped data file, extract, and import data

@EZGraphs on Twitter writes: "Lots of online csvs are zipped. Is there a way to download, unzip the archive, and load ... if I'm a long way off. Any thoughts? Question&Answers:os...

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

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Any way to select without causing locking in MySQL?

Query: SELECT COUNT(online.account_id) cnt from online; But online table is also modified by an event, so frequently ... is there a compatible way to do this? Question&Answers:os...

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

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python - Matplotlib (pyplot) savefig outputs blank image

I am trying to save plots I make using matplotlib; however, the images are saving blank. Here is my code: ... tessstttyyy.png is blank (also tried with .jpg) Question&Answers:os...

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

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Call An Asynchronous Javascript Function Synchronously

First, this is a very specific case of doing it the wrong way on-purpose to retrofit an asynchronous call into a very ... UI. If such a thing is possible in JS. Question&Answers:os...

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

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java - Why can't overriding methods throw exceptions broader than the overridden method?

I was going through SCJP 6 book by Kathe sierra and came across this explanations of throwing exceptions in ... unless it's a subclass of FileNotFoundException. Question&Answers:os...

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

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oop - Why do you need explicitly have the "self" argument in a Python method?

When defining a method on a class in Python, it looks something like this: class MyClass(object): def __init__(self ... the passing of "self" as an argument? Question&Answers:os...

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

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What are the differences between JSON and JavaScript object?

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

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node.js - Fixing npm path in Windows 8 and 10

Have done a lot of googling, tried reinstalling node.js using the official installer, but my npm pathing still doesn't ... install so I can simply type 'npm' ? Question&Answers:os...

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

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javascript - window.onbeforeunload and window.onunload is not working in Firefox, Safari, Opera?

In my chat application I need to get confirmation from user, when my application closes. So I used the window.onbeforeunload ... { logout(); } }); </script> Question&Answers:os...

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

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html - Are there any style options for the HTML5 Date picker?

I am really stoked about the HTML5 date picker. It is refreshing to know that the W3C is finally picking up some ... of day? Any sort of insights are helpful. Question&Answers:os...

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

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java - What is a fat JAR?

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

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html - Data protocol URL size limitations

Is there any size limitation for "data:" URL scheme values? I'm interested in limitations in popular web ... : url(data:image/jpg;base64,base64_encoded_data)? Question&Answers:os...

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

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css - Better way to set distance between flexbox items

To set the minimal distance between flexbox items I'm using margin: 0 5px on .item and margin: 0 -5px on container. For ... div> <div class='item'></div> </div> Question&Answers:os...

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

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c++ - Returning unique_ptr from functions

unique_ptr<T> does not allow copy construction, instead it supports move semantics. Yet, I can return a ... in the language specification that this exploits? Question&Answers:os...

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

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1.3k views

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android: move a view on touch move (ACTION_MOVE)

I'd like to do a simple control: a container with a view inside. If I touch the container and I move the finger ... need to use a surface, but a simple layout. Question&Answers:os...

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

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145 views

1 answer

How to remove xa0 from string in Python?

I am currently using Beautiful Soup to parse an HTML file and calling get_text(), but it seems like I'm ... , xc2 for instance. Can anyone explain this? Question&Answers:os...

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

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930 views

1 answer

mod rewrite - .htaccess redirect all pages to new domain

Which redirect rule would I use to redirect all pages under olddomain.example to be redirected to newdomain.example? The ... How do I keep the last part out? Question&Answers:os...

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

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76 views

1 answer

How to develop a soft keyboard for Android?

Closed. This question needs to be more focused. 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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84 views

1 answer

java - Where is array's length property defined?

We can determine the length of an ArrayList<E> using its public method size(), like ArrayList<Integer> arr ... where is this length property of Array defined? Question&Answers:os...

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

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85 views

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c++ - Is a string literal in С++ created in static memory?

Is a string literal in c++ created in static memory and destroyed only when the program exits? Question&Answers:os...

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

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php - if block inside echo statement?

I suspect it's not allowable because I am getting "Parse error: syntax error, unexpected T_IF in..." error. But I ... as the default. I doesn't work sadly... Question&Answers:os...

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

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200 views

1 answer

css - Center an element in Bootstrap 4 Navbar

No matter what I try, I can't center something in Bootstrap navbar, any solutions for it? I've tried adding a div, using ... ">Contact</a> </li> </ul> </div> Question&Answers:os...

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

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214 views

1 answer

html - Extract URLs from text in PHP

I have this text: $string = "this is my friend's website http://example.com I think it is coll"; How ... especially preg_match() but I don't know how? Question&Answers:os...

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

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218 views

1 answer

javascript - Passing custom props to router component in react-router v4

I'm using React Router to create a multi page app. My main component is <App/> and it renders all of ... my apologies if I'm missing something obvious. Thanks! Question&Answers:os...

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

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138 views

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Java comparison with == of two strings is false?

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

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297 views

1 answer

php - How do I use password hashing with PDO to make my code more secure?

Closed. This question needs to be more focused. 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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150 views

1 answer

html - flex-grow not sizing flex items as expected

It seems that the content inside a flex div affects its calculated size concerning the flex-grow property. Am I doing something ... colon">:</div> </div> </div> Question&Answers:os...

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

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