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Example of typeof operator usage in JavaScript

Using the typeof operator for a value may return one of the following strings: "undefined" - if this value is not defined "boolean" - if this value is a boolean value "string" - if this value is a string "number" -

2025-03-04
JavaScript method to get browser type and version (js get browser version)

Copy the code as follows: function getExplorerInfo() {var explorer = window.navigator.userAgent.toLowerCase() ;//ie if (explorer.indexOf(

2025-03-04
HTML page jump transfer pass parameter problem

The effect is as follows: After clicking the jump button on the A, you can get the corresponding value on page B. The code is as follows: Page A:<!DOCTYPE html><html><head lang=en><meta charset=UTF-8>

2025-03-04
JavaScript array of arrays to quickly disrupt the rearrangement

Copy code code as follows: var arr = [1,2,3,4,5,6,7,8,9,10]; var out = Arr.sort (function () {return math.random ()> 0.5; 0.5; 0.5; }

2025-03-04
Sample code for implementing image mosaic on canvas

1. API used in native canvas implementation 1) getContext(contextID) ---Returns an environment for drawing on the canvas Copy code

2025-03-04
Simple example of JS to achieve the effect of provincial and municipal linkage effects

For example, as follows: Copy code code as follows:

2025-03-04
Introduction to the js frameset framework example that jumps out of the page

Many web pages have a frame structure. In many cases, button click events or links are used to jump out of the frame and go to other interfaces. For example, click "Logout" to return to the login interface. 1. There are several ways to jump out

2025-03-04
HTML5 operates the instance code of the websql database

HTML code:<!DOCTYPE html><html><head lang=en><meta charset=UTF-8><title> Train timetable query</title>

2025-03-04
For details, HTML5 Canvas Common API Summary (2)-Drawing API

Canvas can draw many wonderful styles and beautiful effects. Through a few simple APIs, you can present a ever -changing effect on the canvas. You can also make web games. Next, summarize the API related to drawing. When painting, Canvas is equivalent to

2025-03-04
JS regular expression of the difference between EXEC and MATCH

In the past, JS rarely used JS regular expression. Even if it was used, it was judged such as mail names. There were many online code and few studies. Recently, there are some ways to use regular expressions in development. By the way, there are two defin

2025-03-04
Five methods to achieve the oblique header effect in the table table

Table table, everyone is definitely not unfamiliar with this thing. We can often encounter in the code. So it is necessary to add a sloping head to Table to Table, but how do you achieve this effect? I summarized the following methods: 1. The most simples

2025-03-04
Abominable ie8 prompt missing id undefined

Recently, I have been programming in JavaScript, and I used json and wrote an array [{'id':'key_01','name':'university'},{'id':'key_02','name':'direct card delivery' },{'id':'key_

2025-03-04
Solve the way to solve the gap between the IMG label

In the usual development process, we often need to use multiple pictures. When using multiple pictures, we generally use a list to install our IMG.<!DOCTYPE html><html lang=en><head><meta charset=UTF-8>

2025-03-04
Implementation of the notification function in the lower right corner of the desktop in HTML5 Web Notification

HTML5 Desktop Notifications (Web Notifications) are very useful when you need to have desktop notification effects when new messages come online. Here is a brief introduction to this new attribute of HTML5. Through Web Notifications (desktop notification

2025-03-04
HTML adds the implementation code of the number angle marker on the message button

HTML code:

2025-03-04

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