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Detailed explanation of decimal point multiplication and division problems in javascript(js)

1. What is the result of using js to calculate 12.32 * 7? Answer: 86.24000000000001 Why does this problem occur? How to solve it? There is a bug in js when dealing with multiplication and division of decimals. The solution can be: convert decimals into in

2025-01-26
Sample code for implementing 360-degree panorama using HTML5 Canvas

Many shopping websites now support 360 panoramic images of real objects, and you can choose to view samples at any 360 degrees. This is a good consumption experience for buyers. There are many such plug-ins on the Internet based on jQuery, some are paid o

2025-01-26
A method written in js to view the large image after uploading the image

After querying the image, we also need to add a function to view the large image, so we wrote a method in js, and then called this method in the onmouseover event of the image, so that when the mouse hovers over the small image, the large image will be di

2025-01-26
Example introduction to using requires in ExtJS4

ExtJS4's requires is a new mechanism, mainly to implement asynchronous loading mechanism. In this way, the corresponding js file will not be loaded unless the corresponding button or option is clicked, which improves the loading speed and user waiting

2025-01-26
HTML5 imitation WeChat chat interface and WeChat Moments example code

In the past few days, I have used H5 to develop a WeChat-like chat front-end interface. Especially the bottom editor of WeChat is handled very well. It is developed using HTML5. Although the functions and effects are not as comprehensive as WeChat, it is

2025-01-26
Based on Html5 canvas, the functions of cropping pictures and mosaics and uploading pictures to the cloud are realized.

1. Core functions The functions of this component include: Image cropping (drag the cropping box, and the cropping box changes size); Image mosaic (draw mosaic, clear mosaic); Image preview, image restoration (return to original image, return to processed

2025-01-26
js exit or refresh page detection (and compatible with FF, IE, Chrome)

Copy the code code as follows: <!DOCTYPE html><html><head><script>function closeIt(){return "Any string value here forces a dialog box to /n"

2025-01-26
Example of how to add events to Canvas

As a front-end, adding events to elements is a common thing. But in Canvas, anything drawn on it is unobtainable, let alone adding events, so are we helpless about it? Of course not! We must have used many Canvas frameworks in our daily projects, and we f

2025-01-26
Native JS operates the web page to add onclick events to the p element and change the color of the table every other row.

1. Add onclick event to all p elements in the web page: copy the code as follows: <%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><html><head>

2025-01-26
100 Practical JS Custom Functions You Can’t Miss

1. Native JavaScript implements string length interception and copy code as follows: function cutstr(str, len) {var temp;var icount = 0;var patrn = /[^/x00-/xff]/;var strre

2025-01-25
Event altKey,ctrlKey,shiftKey attribute analysis

event.altKey Function: Detect whether the Alt key is pressed when the event occurs. Syntax: event.altKey Value: true | false Description: The altKey attribute is true to indicate that the Alt key was pressed and held when the event occurred, and false to

2025-01-25
Two ways to determine whether the URL is valid in js

Method 1: (only applicable to ie) Copy the code as follows: function CheckStatus(url){XMLHTTP = new ActiveXObject("Microsoft.XMLHTTP")XMLHTTP.open("HEAD",url,f

2025-01-25
How to make HTML elements such as pre and textarea remove the scroll bar, wrap automatically, and adapt the height of the text content

Pre and textarea in HTML can display preformatted text. i.e. preserve spaces and newlines. Instead of having to add and etc. HTML elements to add line breaks and print spaces. When pre removes the scroll bar, pre displays text content and it will not auto

2025-01-25
Return implementation method in Html5 page

When you see this title, you may think what the hell is this? In fact, what I want to say is this, look at the recording below: This kind of interaction is everywhere in H5 pages. Click on the city -> pop up the city selection floating layer -> pres

2025-01-25
Summary of undefined learning in JavaScript

This is the value returned when an undeclared variable is used, a variable that has been declared but not assigned a value is used, or an object property that does not exist is used. Although undefined and null are not the same, the == operator treats the

2025-01-25

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