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Detailed analysis of the implementation of various trims in Javascript

This is an interview question from lgzx company. It requires adding a method to the String of js to remove the whitespace characters (including spaces, tabs, form feeds, etc.) on both sides of the string. Copy the code as follows: String.prototype.trim =

2025-01-26
A detailed explanation of the pitfalls of HTML5 recording

A project I worked on some time ago was to develop an audio courseware. Basically, after importing documents, pictures and other resources, the page becomes a PPT-like layout, and then you can select a picture to insert audio, and there are single-page ed

2025-01-26
Random example of random function that generates random numbers in js

JavaScript Math.random() built-in function random function return value returns a pseudo-random number between 0 and 1, which may be 0, but is always less than 1, [0,1) random function example //returns a random number document.write( Math.random());

2025-01-26
Analysis of usage examples of for in in js

for(var i=0;i

2025-01-26
Detailed explanation of shopping mall monitoring examples based on HTML5 Canvas

With the rapid development of the domestic economy, people have higher and higher requirements for safety. In order to prevent the following situations from happening, you need to consider installing a security system: Provide evidence and clues: In many

2025-01-26
An in-depth analysis of the role of top in js

Every WINDOW object, whether it is a regular HTML page. Frameset page. Whether a child frame or a grandchild frame, both have a TOP attribute. This property returns a reference to the top-level WINDOE object loaded into the browser; . If the WINDOW object

2025-01-26
Detailed analysis of js clipboard application clipboardData

Note: IE7 and IE8 have copy permissions for web pages. You need to set the clipboardData object in the "Custom Level" script in "Security" to provide access to the clipboard. Three methods 1.clearData(sDataFormat) deletes the data in t

2025-01-26
js implements array deduplication and determines whether the contents of arrays and objects are the same

Copy the code as follows: /* *Remove duplicate array elements*/ if(typeof Array.prototype.distinct != "function"){ Array.prototype.distinct = function(){ this.s

2025-01-26
js login popup layer special effects

Copy the code code as follows:

2025-01-26
Introduction to the use of Javascript rounding Math.round() and Math.pow()

Copy the code code as follows:

2025-01-26
Implementation of fixed html Table header

This article introduces the implementation of html Table header fixation and shares it with everyone. The details are as follows:<div class=wrapbox><div class=table-head><table><thead>

2025-01-26
Example of using mixins to implement multiple inheritance in ExtJS4

Use mixins to implement multiple inheritance in ExtJS4. The specific example code is as follows: Copy the code as follows: (function(){ Ext.onReady(function(){ Ext.define('say',{ canSay:function(){ al

2025-01-26
Use canvas to implement image download function to solve browser compatibility issues

Preface: The image download function needs to be implemented in the project. The first thing that comes to mind is to use the download attribute of the a tag to achieve it. However, when testing under different browsers, it will be found that some browser

2025-01-26
Html5 original Tetris (based on canvas)

The first time I wrote Tetris was more than a year ago, and I had just learned js not long ago. In order to strengthen my understanding of JS and add my love for games, I wrote Tetris based on canvas using the most basic JS code without referring to other

2025-01-26
The difference between two ways of writing JavaScript to determine whether a variable is undefined

At work, we often need to determine whether a variable/property is undefined. There are usually two ways to copy the code. The code is as follows: // Method 1 typeof age === 'undefined'; // Method 2 age === undefined What is the difference between

2025-01-26

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