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Web design tutorial

A brief discussion on the 35 rules of Yahoo front-end optimization

Abstract: Whether at work or in an interview, optimizing web front-end performance is very important. So what aspects do we need to start with optimization? You can follow Yahoo’s 34 Catch-Rules for front-end optimization, but now it’s 35, so it can be sa

2025-03-13
How to download QR code and watermark images on canvas

Yesterday I introduced a plug-in for generating QR codes, QRCode.js, which is drawn with the help of HTML5 Canvas. So, today’s protagonist is canvas – the practical application of canvas. 1. Download the QR code HTMLCanvasElement provides the toDataURL me

2025-03-13
Detailed explanation of the difference between JavaScript defining functions and expression definition functions

I have used JavaScript for many years and wrote countless functions, but today I really understand the difference between the definition of the two functions. It is really a tragedy. I wrote down this essay and reminded myself to lay the foundation. It&#3

2025-03-13
js displays base64-encoded binary streaming web page pictures

Data URI scheme. The Data URI scheme is defined in RFC2397, with the purpose of embedding some small data directly into a web page, so that it does not need to be loaded from external files anymore. For example, the string of characters above is actually

2025-03-13
JS Cleanings Word Format Example Code

Copy code code as follows:<input type="button" onclick="cleanWord();" value="Word清理" /> Cleanword = function () {var editbody = fckeditor

2025-03-13
The parsing and execution order of javascript is different in each browser

Introduction JavaScript is an interpreted language whose execution is top-down. However, each browser has slight differences in its understanding of [top-down], and the upstream and downstream of the code, that is, the program flow, is crucial for the cor

2025-03-13
Method example of javascript printing html content function

Copy the code code as follows:

2025-03-13
Detailed analysis of the difference between Opener and Parent in js

Opener is the one who opened me. For example, Page A uses Window.open to pop up the B. Page window window. Then the window where the A page is located is the opener of the page B. Page can access the A page on the BPENER object. Parent indicates that the

2025-03-13
How to use javascript to determine whether two IP addresses are in the same network segment

1) Basic idea: To determine whether two IP addresses are in the same network segment, perform an AND operation on their IP addresses and subnet masks respectively. The result obtained is the network number. If the network numbers are the same, they are in

2025-03-13
Use JS to complete the operation of the addition, deletion, modification and copy of the node, etc.

Requirement: Complete the method and attributes of the operation of the node, deletion, modification, and copying: 1. Get the parent node Parentnode attribute of the parent node of a node 2. Get the child node of the node node collection ChildNode attribu

2025-03-13
Floating and clearing floating in the summary page

1. FLOAT: The main purpose is to achieve the effect of texting pictures. It has also become the simplest way to create a multi -column layout.<img src= /><p> Text content paragraph content text content content paragraph content content content content c

2025-03-13
JS implementation of mouse drag and move subform

1. Subform When designing a website, we need to design some modal subforms. For example, this step is easy to implement. Just div+css is OK. Please see the code: Copy the code as follows:<div></div><div><div><center> Clicking on the block area can change

2025-03-13
Compared with div and span in html

one,<div></div> and<span></span> 1.<div></div> Label<div></div> The label can define the partition or section in the document (division/section) to divide the document into an independent and different part.<div></div> Tags can be used as

2025-03-13
Canvas series filter effects

Canvas is really a magical thing. It can not only draw various graphics, text and bitmaps, but also perform complex pixel operations and processing on bitmaps. Therefore, things like filters can actually be implemented using Canvas. Next, it’s time to wit

2025-03-13
Html5 drag and drop function

Drag and Drop are part of the HTML5 standard. The browser supports Internet Explorer 9, Firefox, Opera 12, Chrome, and Safari 5 support drag and drop. Drag element, dragelement: 1, add things

2025-03-13

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