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JavaScript 3D Detective Product Display (Core Lite)

3D javascript image material javascript part of the code copy code as follows:<span style="white-space:pre"> </span>var step = 0; var first = 0; var lth = docume

2025-02-22
HTML5 empty canvas (three types)

Summarize the following three ways to clear the Canvas canvas: 1. The easiest way: Because the content of the canvas will be emptied when the height or width is reused, the following method can be cleared: Function Clearcanvas

2025-02-22
Introduction to the usage example of array Array in JS

new Array() new Array(len) new Array([item0,[item1,[item2,...]]]] Method to use array object: var objArray=new Array(); objArray.concact([

2025-02-22
A brief analysis of the problem of setting width and height in Canvas

Recently, due to work needs, I learned about the Canvas tag in Html. Canvas is a new component of HTML5. It is like a curtain on which various charts, animations, etc. can be drawn using JavaScript. In the era before Canvas, drawing could only be achieved

2025-02-22
Use js to determine whether the current time zone TimeZone is daylight saving time

The code copy is as follows: var d1 = new Date(2009, 0, 1); var d2 = new Date(2009, 6, 1); if (d1.getTimezoneOffset() != d2.getTimezoneOffs

2025-02-22
A brief analysis of implicit type conversion in JavaScript

If you explicitly convert a certain type to another type through a function or method call, it is called explicit conversion, and the opposite is called implicit type conversion. The words "display type conversion" and "implicit type conver

2025-02-22
Introduction to cited examples in Javascript

In Javascript scripts, the reference principle of parameters: the referenced parameters can be modified internally (such as properties), but the reference corresponding to the parameters cannot be modified. An example of a test is as follows: Copy the cod

2025-02-22
Detailed explanation of HTML5 data-* custom attributes

In jQuery's attr and prop, it is mentioned that improper use of property in versions before IE9 will cause memory leaks, and the difference between Attribute and Property is also very troublesome. In HTML5, the data-* method is added to customize attr

2025-02-22
How to draw dotted lines on canvas using trigonometric functions

Because the canvas api does not have a dotted line, you need to implement it yourself. By the way, wouldn’t it be nice to review the trigonometric functions? var context=document.getElementById(canvas).getContext(2d); function drawDashedLi

2025-02-22
JS judgment data type, such as determining whether the array is a string, etc.

1 Determine whether it is an array type 2 Determine whether it is a string type 3 to determine whether it is numerical type. 4 Determine whether it is the date type.

2025-02-22
Sample code for canvas-based skeletal animation

Recently, I learned about a skeletal animation of canvas. As you can tell from the name, it is different from the previous animation of canvas. I wonder if you are interested in learning about it? About skeletal animation, I first saw it accidentally on t

2025-02-22
45 Practical Tips JavaScript Programmers Should Know

As you know, JavaScript is the number one programming language in the world, it’s the language of the web, it’s the language of mobile hybrid apps (like PhoneGap or Appcelerator), it’s the language of the server side (like NodeJS or Wakanda)

2025-02-22
JavaScript form validates phone number through regular expression

JavaScript form validates the phone number and determines whether an input quantity is a phone number, which is implemented through regular expressions. Copy the code code as follows: //Check the phone number function isTel(str){ var reg=/^([0-9]|[/-])+$/

2025-02-22
IFRAME window height adaptive implementation method

There is a page in Domaina. INDEX.HTML, which is nested with a page in Domainb. Other.html is displayed in the IFRame.html page, and its page content will increase or decrease dynamically. Now it is necessary to remove the IFRAME rolling bar. Due to J

2025-02-22
Sample code for implementing the automatic matching function of Baidu input box in JS

Many websites now have this effect. Enter a character in the text box, and the matching content will appear below. This code demonstrates how this function is completed. Of course, this is static. You can use the prompt content from When reading the datab

2025-02-22

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