javascript - Weird Symbol problem

These are the two lines of code extracted. var name = Symbol('test') keeps prompting that it cannot be converted. Is the keyword reserved? Or other reasons? Why can it be compiled by replacing var name1 = Symbol('test')? Other ordinary var s1 s2 can also be compiled.

给我你的怀抱 2017-06-26 10:55:19 0  4  963

javascript - How to package webpack2 to convert all es6 to es5?

The packaging posture of webpack2 may be wrong, and the transcoding compatibility is not very good. Here is my webpack.config.js configuration file (some irrelevant ones are omitted): {code...} Run on Huawei p7 mobile phone, console Display: {code...} Apparently ES6's string template feature doesn't...

天蓬老师 2017-06-26 10:57:28 0  1  1040

Equivalent writing of code.co_kwonlyargcount in Python2

Suppose there is a piece of code like this: {code...} For Python3, we can get the keyword argument to be 0 through c.co_kwonlyargcount. For Python2, how to implement equivalent writing and get the corresponding key The number of word parameters.

天蓬老师 2017-05-24 11:35:02 0  2  700

php - What can a for loop be used for?

Many functions in PHP are implemented using for loops. For example, string conversion problems, calculating the number of executions, etc. I feel that the for loop is very useful and can solve many underlying problems. Can any expert summarize the use of for loops in programming?

高洛峰 2017-05-17 09:55:18 0  2  593

How to modify the style dictionary configuration file to output typesetting marks as SCSS variables

I'm new to both designing tokens and designing systems. I'm trying to use a style dictionary to convert my design markup into SCSS variables and everything seems to be working fine except that the typography markup turns out to be [objectobject] in the variables file. Not sure what I'm doing wrong. ...

P粉481035232 2024-02-03 16:19:02 0  1  1473

javascript - How to use canvas to convert the content in a div into an image without using a plug-in.

Many people on the Internet mentioned using canvas, but the key content conversion part seems to be mostly assisted by plug-ins, and the only example I found that did not rely on plug-ins ran incorrectly. I would like to ask a master how to convert the content in a div into an image without using a ...

巴扎黑 2017-05-24 11:36:16 0  3  919

Questions about dates growing periodically and inserted into the database

//Get a (string character time), b (number of times) from the form. $b=$_POST['b']; //Number of times $a = $_POST['a']; //Date$d = strtotime($a); //Convert string time to timestamp. //The database is simple in design, automatically growing the three fields id, a, and b. The connection code is omitte...

用岁月换光辉 2019-05-04 16:07:40 0  0  1005

objective-c - 用约束调整label，如何利用约束计算其父控件的动态高度

描述你的问题在storyboard上 拖一个view 设置好约束， 拖一个label ，设置左、上、宽度约束，label 文字变化的时候view 高度也要跟随变化，如何计算label文字变化 贴上相关代码 (void)viewDidLoad { {代码...} } ...

ringa_lee 2017-05-02 09:18:30 0  1  679

How to deal with absolute directories in Nginx reverse proxy?

Scenario requirements: Now we need to design an external gateway server to act as an agent for many other services within the company. The method currently used is nginx reverse proxy. The code in Nginx.conf is as follows {code...} Problems encountered When the html code of a certain service contain...

PHP中文网 2017-06-16 09:19:40 0  1  1014

Shortest way to convert all PHP types to string

I'm writing a general system that I hope can one day be applied to fields like medicine (i.e. it's "scientific"). I think the best way is to represent all the data in php with strings (true will be "true", false will be "false" and so on). The reason for this is that in...

P粉369196603 2023-09-05 15:34:44 0  1  1066

Toggle text area to switch between HTML code and preview

I want to use textarea to switch between HTML code and preview html. When the HTML is clicked, it shows the code of the hidden textarea. When the HTML is clicked again, it shows it again. I want to design something like this. I have tried <style> .container{width:500px;position:fixed;}.right-e...

P粉006977956 2024-03-31 11:52:47 0  1  480

java - In order to avoid the complex one-to-many-to-many relationship in the database, I designed the database without foreign keys. Is this possible?

In order to avoid the complex one-to-many-to-many relationship in the database, I designed the database so that the fields in the table have no foreign keys, and the relationships are manually related using setters and getters. However, after writing the program, the function can be implemented, but...

为情所困 2017-05-17 10:08:09 0  5  588

HTML, CSS for mailing

I'm working on some newsletters for my company and we're dealing with some issues with different email clients, eg. Gmail, Outlook online, Outlook in app, mobile versions of these clients. Each of these texts looks different. The problem is also that the Outlook application does not properly support...

P粉268284930 2023-09-08 19:02:38 0  1  709

How to display single SQL query results in PHP

I have a query about this php code and can't display the results in echo, can I convert to string? //conexion is my function that connects to the database and is completed $costTotal=conexion();$costTotal=$costTotal->query("SELECTSUM(product_cost)FROMproduct");echo$costTotal;For example...

P粉852578075 2023-08-17 20:30:29 0  1  608

objective-c - I would like to ask some questions about the understanding of the atomic keyword of @property.

1. When learning about multi-thread safety, I learned to use synchronization locks to avoid "simultaneous" access to the same resource when multiple threads execute concurrently. I remembered that when I was learning atomic before, I remembered that this keyword is used to set whether the ...

大家讲道理 2017-05-02 09:29:14 0  2  605

Brother Zhu Chat: How do PHP programmers memorize code?

Many friends on the php Chinese website should know that when Brother Zhu learned programming, he had many twists and turns and gave up several times. Today, I am catching a cold and don’t want to work, so I will share with you how I memorized code words more than 10 years ago. . From the first time...

- 2019-11-27 16:23:11 7  22  10183

mysql - schema database design for Q&A website?

I am new to Django and am ready to imitate a simplified segfmentfault website. Now I have a few questions. {Code...} Now in the database area, anti-paradigm database design is recommended. Is this kind of Q&A website suitable for using foreign keys? What fields are missing from my table? These a...

过去多啦不再A梦 2017-06-30 09:53:50 0  1  1022

What is the equivalent function in PHP that implements the 'requests.post' functionality in Python?

I need help translating python code to PHP. This is how the script is set up to communicate with the API server, using POST to log in in this part of the code. The Python code has been tested and works, but I can't figure out exactly which way I should convert it to PHP because I'm getting an empty ...

P粉495955986 2024-03-28 14:48:16 0  1  411

How to access properties inside PHP?

Follow up on the basis of this document: https://www.php.net/manual/en/language.oop5.references.php A key point of PHP object-oriented programming that is often mentioned is that "objects pass by reference by default transfer". This is not entirely correct. In PHP, object variables do not ...

P粉518799557 2023-09-05 18:50:40 0  1  641

How to create a satisfying web design

It cannot display my own designs. I want to create a redesign. Creating a web design is a multifaceted process that requires aesthetics, functionality, and user experience to be seamlessly blended together. It starts with a deep understanding of the website’s purpose, target audience, and brand. A w...

P粉908643611 2023-08-10 17:09:33 0  1  575