Tag：javascript
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Time：2021-10-8
When doing the project, write a JS for everyone. The problem of limiting the number of words in text is often used in practical development; The main problem is the restriction on Chinese. The following code solves the verification problem of limiting the number of bytes; As long as the code is saved in a […]
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Time：2021-10-5
1、 Basics (method of date object) Getfullyear() is used to return a 4-digit number representing the year Getmonth () returns a number representing the month, but the return value is an integer between 0 (January) and 11 (December) Getdate() returns a day Gethours() returns the hour field of the time Getminutes() returns the minute field […]
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Time：2021-10-3
//by South of summer [Ctrl + a full selection note: you need to refresh the page to import external JS]
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Time：2021-9-29
Regular expression constructor: new RegExp(“pattern”[,”flags”]); Parameter Description: pattern — A regular expression text flags — If present, it will be the following values: g: Global matching i: ignore case gi: Above combination In the constructor, some special characters need to be converted (add “\” before the special characters). Special […]
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Time：2021-9-19
What is a regular expression?For this problem, see “regular expression 30 minute tutorial”. Many programming languages support regular expressions. This article only discusses regular expressions in JavaScript.Create a regular expressionThe first method: Copy codeThe code is as follows: var reg = /pattern/; The second method: Copy codeThe code is as follows: var reg = new […]
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Time：2021-9-12
[Ctrl + a full selection note: you need to refresh the page to import external JS]
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Time：2021-9-12
How to use Jupiter notebook in VSC is also added later Install Anaconda I installed the installation part directly using anaconda. Just download MSI. It’s not difficult. An error is encountered and anaconda is configured The error information is as follows: D:\>jupyter notebook Traceback (most recent call last): File “C:\ProgramData\Anaconda3\Scripts\jupyter-notebook-script.py”, line 6, in <module> from […]
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Time：2021-9-9
use Javascript Parsing links (URLs) is a common requirement. This paper introduces a very sound user interface Javascript Write a link (URL) parsing class, he can accurately get a complete URL URL Contents of each part in the, including protocol, user name and password contained in the URL, host […]
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Time：2021-8-28
catalogue 1、 Method of use 1. Basic usage 2. Second parameter — filter 3. The third parameter — string indentation 4. Tojson () method — custom JSON serialization 2、 Usage scenario 1. Determine whether the array contains an object or whether the objects are equal. 2. When using localstorage / sessionstorage 3. Implement object deep […]
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Time：2021-8-25
catalogue 1、 How to view binary data of a picture 2、 How to distinguish the types of pictures 3、 How to detect the type of picture 3.1 defining the readbuffer function 3.2 define check function 3.3 test PNG picture type We will think of limiting the uploaded file type through the accept attribute of the […]
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Time：2021-8-16
Copy codeThe code is as follows: /** *Regular expression check for hours: minutes < br >* <br> *@ param Pinput string to check*@ return Boolean returns the check result*/ public static boolean isUrl (String pInput) { if(pInput == null){ return false; } String regEx = ” ^([0-1]{1}\d|2[0-3]):([0-5]\d)$”; Pattern p = Pattern.compile(regEx); Matcher matcher = p.matcher(pInput); […]
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Time：2021-8-11
function trim(str) { return str.replace(/(^\s*)|(\s*$)/g, “”); }
