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javascript - Do DOM tree elements with ids become global variables?

Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and ... for the getElementById method in these browsers? Question&Answers:os...

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

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104 views

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python - "is" operator behaves unexpectedly with integers

Why does the following behave unexpectedly in Python? >>> a = 256 >>> b = 256 >>> a is b True # This ... don't know in advance whether they are numbers or not? Question&Answers:os...

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

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python - What is the purpose of the word 'self'?

What is the purpose of the self word in Python? I understand it refers to the specific object created ... come across in my (admittedly limited) experience. Question&Answers:os...

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

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191 views

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How can I convert ereg expressions to preg in PHP?

Since POSIX regular expressions (ereg) are deprecated since PHP 5.3.0, I'd like to know ... to preg_match Changing ereg_replace to equivalent preg_replace Question&Answers:os...

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

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247 views

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javascript - Storing Objects in HTML5 localStorage

I'd like to store a JavaScript object in HTML5 localStorage, but my object is apparently being converted to a ... but the answers still may be of interest. Question&Answers:os...

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

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javascript - How can I remove a specific item from an array?

I have an array of numbers and I'm using the .push() method to add elements to it. Is there a ... have to use core JavaScript. Frameworks are not allowed. Question&Answers:os...

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

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javascript - Copy array by value

When copying an array in JavaScript to another array: var arr1 = ['a','b','c']; var arr2 = arr1; arr2. ... can I copy the array to get two independent arrays? Question&Answers:os...

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

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css - What methods of ‘clearfix’ can I use?

I have the age-old problem of a div wrapping a two-column layout. My sidebar is floated, so my container ... currently available to us is the most robust? Question&Answers:os...

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

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r - Split comma-separated strings in a column into separate rows

I have a data frame, like so: data.frame(director = c("Aaron Blaise,Bob Walker", "Akira Kurosawa", "Alan J. ... the director column and 'A' in the AB column. Question&Answers:os...

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

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version control - How to remove/delete a large file from commit history in the Git repository?

I accidentally dropped a DVD-rip into a website project, then carelessly git commit -a -m ..., and, ... and is cleaned in the garbage collection procedure? Question&Answers:os...

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

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javascript - How do you use a variable in a regular expression?

I would like to create a String.replaceAll() method in JavaScript and I'm thinking that using a regex would be ... I pass this variable in to my regex string? Question&Answers:os...

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

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C++ Singleton design pattern

Recently I've bumped into a realization/implementation of the Singleton design pattern for C++. It has looked like this ... do I implement it in the right way? Question&Answers:os...

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

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c - Is an array name a pointer?

Is an array's name a pointer in C? If not, what is the difference between an array's name and a pointer variable? Question&Answers:os...

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

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How to manage startActivityForResult on Android

In my activity, I'm calling a second activity from the main activity by startActivityForResult. In my second ... check the result from the main activity? Question&Answers:os...

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

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179 views

1 answer

Is there a JavaScript / jQuery DOM change listener?

Essentially I want to have a script execute when the contents of a DIV change. Since the scripts are separate ( ... could set up polling but that seems sloppy. Question&Answers:os...

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

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What is SQL injection?

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

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

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90 views

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c++ - How to remove "noise" from GCC/clang assembly output?

I want to inspect the assembly output of applying boost::variant in my code in order to see which intermediate ... " .section .note.GNU-stack,"",@progbits Question&Answers:os...

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

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263 views

1 answer

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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80 views

1 answer

How do I pass JavaScript variables to PHP?

I want to pass JavaScript variables to PHP using a hidden input in a form. But I can't get the value of ... > Code for displaying the query result. </table> Question&Answers:os...

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

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147 views

1 answer

python - How to make function decorators and chain them together?

How can I make two decorators in Python that would do the following? @makebold @makeitalic def say() ... understand how decorators and decorator chaining works. Question&Answers:os...

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

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146 views

1 answer

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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127 views

1 answer

How to round a number to n decimal places in Java

What I would like is a method to convert a double to a string which rounds using the half-up method - i.e. if ... What is the best way to achieve this in Java? Question&Answers:os...

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

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338 views

1 answer

c++ - What is this weird colon-member (" : ") syntax in the constructor?

Recently I've seen an example like the following: #include <iostream> class Foo { public: int bar; Foo(int num): ... you'll never find in an ordinary C++ book? Question&Answers:os...

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

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234 views

1 answer

How to deal with floating point number precision in JavaScript?

I have the following dummy test script: function test() { var x = 0.1 * 0.2; document.write(x); } test(); Question&Answers:os...

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

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173 views

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Is Chrome's JavaScript console lazy about evaluating arrays?

I'll start with the code: var s = ["hi"]; console.log(s); s[0] = "bye"; console.log ... s JavaScript console being exceptionally lazy about evaluating my array? Question&Answers:os...

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

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116 views

1 answer

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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317 views

1 answer

rest - HTTP GET with request body

I'm developing a new RESTful webservice for our application. When doing a GET on certain entities, clients can ... https://www.rfc-editor.org/rfc/rfc2616 Question&Answers:os...

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

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676 views

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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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