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Comparison of js string intercept functions slice, substr and substr

In js, there are three commonly used slice(), substr(), and substr() in character intercept function. Let me introduce to you some usage and differences between slice(), substr(), and substr() functions when intercepting characters. Three functions to tak

2025-07-24
Bootstrap custom file upload download style

In daily work, the file upload and download function is an indispensable part. Bootstrap front-end style frameworks are also used more often. Now, based on bootstrap's powerful style templates, customize a style for downloading files. In the future, w

2025-07-24
Summary of common operation methods for various reference types in JavaScript

Object type Array type reordering method: compare ascending order: function compare(value1, value2){ if (value1<value2){ return -1; } if (value1> valu

2025-07-24
Simple example of javascript converting Chinese digital formats to European digital formats

A requirement in the project is to change the Chinese-style display of Arabic numerals to European-style, that is, every three digits are displayed, separated by commas in the middle, such as 12345678 to 12, 345, 678. The following is the specific impleme

2025-07-24
Implementation method of displaying multiple decimal places after js decimal calculation

First write a demo to reproduce the problem. I am using a js online test environment [Open] to overwrite the displaynum() function function displaynum(){var num = 22.77;alert(num + 10);} Click the Show button and the result shows 32

2025-07-24
Sharing of examples of using CSS+JavaScript or pure js to achieve translucent masking effect

CSS+JavaScript implementation principle: Create a full screen div, use absolute positioning, so that it can be separated from the document stream, without affecting other elements, and set it to a translucent state. Of course, this transparency can be adj

2025-07-24
Simple example of js determining the number of times a character appears

js simple instance of determining the number of times a character appears function patch(re,s){ // Parameter 1 regular expression, parameter 2 string re=eval_r("/"+re+"/ig"); //Case-sensitive, if required, remove i and change to re=eva

2025-07-24
How to delete local variables by js

alert('value:'+str+'/ttype:'+typeof(str)) //Before declaring the variable, refer to var str="dd";alert('value:'+str+'/ttype:'+typeof(str)) //After declaring and assigning the variable, refer to

2025-07-24
Three.js Learning Orthogonal Projection Camera

Preface Three.js is a 3Djs library, one of the better webGL open source frameworks. In addition to webGL, Three.js also provides a renderer based on Canvas and SVG tags. It is recommended to use Chrome or Firefox for debugging. 1. Camera in camera graphic

2025-07-24
JavaScript code to implement simple calculator

Today I was bored and wanted to write something, but suddenly I thought of writing a calculator in JavaScript. There are still many bugs in the program. I will record it here first and then slowly correct it later. The code is as follows:

2025-07-24
Summary of related operations of javascript objects

We know that the browser object model (BOM) is one of the components of javascript, which provides objects that interact with the browser window independently of the content. Its hierarchical structure is as follows: the window object is the core of the e

2025-07-24
JS prototype chain and inheritance analysis (first experience)

First, define an object obj, and the prototype of the object is obj._proto_. We can use the getPrototypeOf method in ES5 to query the prototype of obj. We prove whether the prototype of obj is equal to Object.prototype to prove whether the prototype of ob

2025-07-24
How to prevent duplicate submissions in JS Ajax request

I haven't written JS code for a long time and just encountered such a problem. Most forms in our system are not done to prevent duplicate submissions. Since you don't want to process it on the backend, if it is processed by the backend, you need t

2025-07-24
Bootstrap component (one) menu

Glyphicons font icon base class.glyphicon {position/top/display/font-family/}specific class{content} -- Key points for use on pseudo-elements: a. Base class + concrete class b. Add a space between general icon and text to note:

2025-07-24
Sharing examples of writing crawlers to crawl Wikipedia content under Node.js environment

Basic idea:master: Starting from a certain category of Wikipedia (such as aircraft carrier (key) page, find out all targets containing key (aircraft carrier) in the title attribute of the link, and add them to the queue to be crawled. In this way, while g

2025-07-23

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